Is Microsoft 365 (Business or Enterprise) down?

User impact: Users may be unable to access multiple Microsoft 365 services. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section may be impacted. Next update by: Tuesday, October 13, 2026, at 11:30 AM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We’ve identified that a section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. We’re applying performance and traffic optimizations to remediate impact and restore connectivity. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 1:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're continuing to apply the aforementioned traffic and performance optimizations with early signals showing signs of recovery. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We've deployed the traffic optimizations and although we saw a reduction of errors initially, this did not fully resolve the issue. We're continuing to troubleshoot the issue to develop additional mitigation strategies. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're redirecting traffic from the underperforming infrastructure to improve service health. We're monitoring to confirm this will fully resolve impact. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Root cause: A section of GSA infrastructure is performing below acceptable performance thresholds, affecting connectivity to Microsoft 365 services and resulting in impact. Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're redirecting traffic from the underperforming infrastructure to improve service health. We're monitoring to confirm this will fully resolve impact. Scope of impact: Some users in Germany and the United Kingdom attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Next update by: Tuesday, October 13, 2026, at 3:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We've completed redirecting traffic to healthy infrastructure and are assessing for positive trends towards recovery. We're continuing to investigate additional mitigating actions to expedite remediation. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Next update by: Tuesday, October 13, 2026, at 4:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're restarting a portion of impacted infrastructure where we've removed traffic and are seeing positive trends towards recovery. We've confirmed through internal testing that this resolves impact for some users and we're monitoring to validate the full recovery of the service. Start time: Tuesday, October 13, 2026, at 8:00 AM UTC Next update by: Tuesday, October 13, 2026, at 5:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs Current status: We're continuing our targeted restarts throughout the impacted infrastructure, and our telemetry shows services hosted on the restarted infrastructure are now operating at healthy service levels. We're also receiving confirmation that impact is resolved for some users. Scope of impact: Some users in Germany attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 7:40 AM UTC Next update by: Tuesday, October 13, 2026, at 6:30 PM UTC

User impact: Users may be unable to access multiple Microsoft 365 services using GSA. More info: Impacted services may include, but aren't limited to: - Outlook - Outlook on the web - OneDrive - SharePoint Online - Microsoft Teams - Windows 365 Cloud PCs As a workaround, users may disable GSA to access the affected Microsoft 365 services until the resolution of this incident. Current status: We're finishing our restarts throughout the affected infrastructure and expect this will be complete and resolve all impact by Tuesday, October 13, 2026, at 7:00 PM UTC. Our telemetry is showing service recovery, and we'll continue to monitor to ensure full remediation. Scope of impact: Some users in Germany attempting to access Microsoft 365 services listed in the More info section using GSA may be impacted. Start time: Tuesday, October 13, 2026, at 7:40 AM UTC Next update by: Tuesday, October 13, 2026, at 8:00 PM UTC

User impact: Admins may be unable to review Service health or Message center postings in the Microsoft 365 admin center. More info: Users may also see nothing in the "What's new" tab in the Microsoft Teams admin center and are returned an error stating "We can't load data. Try again." Current status: We've received reports from a subset of affected users who have reported that they are unable to review Service health or Message center postings in the Microsoft 365 admin center or see new activities in the “What’s new” tab in the Microsoft Teams admin center. We've isolated that a recent service update introduced a misconfiguration which causes the Service Health and Communications API to return authentication errors, resulting in impact. We're rolling back the offending update and monitoring for remediation. We anticipate impact to be resolved by our next scheduled update. Scope of impact: This issue affects some admins who may be unable to review Service health or Message center postings in the Microsoft 365 admin center or see new activities in the “What’s new” tab in the Microsoft Teams admin center. This section may be updated as the investigation progresses. Start time: Monday, October 12, 2026, at 9:54 PM UTC Estimated time to resolve: We anticipate impact to be resolved by Tuesday, October 13, 2026, at 8:00 PM UTC. Root cause: A recent service update introduced a misconfiguration which causes the Service Health and Communications API to return authentication errors, resulting in impact. Next update by: Tuesday, October 13, 2026, at 8:00 PM UTC

User impact: Admins may be unable to review Service health or Message center postings in the Microsoft 365 admin center. More info: Users may also see nothing in the "What's new" tab in the Microsoft Teams admin center and are returned an error stating "We can't load data. Try again." Current status: We're continuing to monitor recovery, and we anticipate some users will start to see remediation at this time. To ensure impact is fully remediated, we've extended our monitoring period, and we anticipate impact to be resolved by our next scheduled update. Scope of impact: This issue affects some admins who may be unable to review Service health or Message center postings in the Microsoft 365 admin center or see new activities in the “What’s new” tab in the Microsoft Teams admin center. This section may be updated as the investigation progresses. Start time: Monday, October 12, 2026, at 9:54 PM UTC Estimated time to resolve: We anticipate impact to be resolved by Tuesday, October 13, 2026, at 10:00 PM UTC. Root cause: A recent service update introduced a misconfiguration which causes the Service Health and Communications API to return authentication errors, resulting in impact. Next update by: Tuesday, October 13, 2026, at 10:00 PM UTC

User impact: Admins may be unable to review Service health or Message center postings in the Microsoft 365 admin center. More info: Users may also see nothing in the "What's new" tab in the Microsoft Teams admin center and are returned an error stating "We can't load data. Try again." Current status: We're continuing to monitor recovery, and we anticipate some users will start to see remediation at this time. To ensure impact is fully remediated, we've extended our monitoring period, and we anticipate impact to be resolved by our next scheduled update. Scope of impact: This issue affects some admins who may be unable to review Service health or Message center postings in the Microsoft 365 admin center or see new activities in the “What’s new” tab in the Microsoft Teams admin center. This section may be updated as the investigation progresses. Start time: Monday, October 12, 2026, at 9:54 PM UTC Estimated time to resolve: We anticipate impact to be resolved by Tuesday, October 13, 2026, at 10:00 PM UTC. Root cause: A recent service update introduced a misconfiguration which causes the Service Health and Communications API to return authentication errors, resulting in impact. Next update by: Tuesday, October 13, 2026, at 10:00 PM UTC

User impact: Admins may have been unable to review Service health or Message center postings in the Microsoft 365 admin center. More info: Admins' "What's new" tab in the Microsoft Teams admin center may have been blank and displayed an error stating, "We can't load data. Try again." Final status: We've completed our monitoring period and validated that the rollback of the service update containing the misconfiguration successfully remediated impact. Scope of impact: This issue affected some admins attempting to review Service health or Message center postings in the Microsoft 365 admin center or see new activities in the “What’s new” tab in the Microsoft Teams admin center. Start time: Monday, October 12, 2026, at 9:54 PM UTC End time: Tuesday, October 13, 2026, at 7:35 PM UTC Root cause: A recent service update introduced a misconfiguration which caused the Service Health and Communications API to return authentication errors, resulting in impact. Next steps: - We're analyzing the offending service update to determine why the potential for impact wasn't caught during our internal update testing and validation phases. This further analysis will help us to improve our update implementation processes moving forward to ensure similar impact scenarios don't occur in the future. This is the final update for the event.

Current status: We're investigating a potential issue impacting admin access to the Microsoft 365 admin portal in certain regions and we're checking for impact to your organization. We'll provide an update within 30 minutes.

User impact: Admins intermittently may be unable to access the Microsoft 365 admin center. Current status: We’re investigating an unusually large increase in requests to the Microsoft 365 admin center and expect that this increase is resulting in requests queuing and timing-out. We’re reviewing options for mitigating this issue and determining if other factors are contributing to the problem. Scope of impact: Admins attempting to access the Microsoft 365 admin center may be intermittently affected. Next update by: Wednesday, October 6, at 12:30 AM UTC

User impact: Admins intermittently may be unable to access the Microsoft 365 admin center. Current status: We're continuing to analyze the unusually large increase in requests to the Microsoft 365 admin center along with recent service updates to isolate potential sources of impact that contributed to the traffic increase. We’ve implemented performance optimizations to assist with processing affected traffic and we've validated that service availability has recovered to pre-impact levels. We're continuing our investigation in order to isolate and remediate the underlying root cause to ensure the similar scenario does not occur again in the future. Scope of impact: Admins attempting to access the Microsoft 365 admin center may be intermittently affected. This section may be updated as the investigation progresses. Start time: Monday, October 5, 2026, at 10:28 PM UTC Next update by: Tuesday, October 6, 2026, at 1:30 AM UTC

User impact: Admins intermittently may have been unable to access the Microsoft 365 admin center. Final status: We've validated that an unexpected influx in requests caused performance degradation and failures for admins attempting to access the Microsoft 365 admin center. We've implemented additional performance optimizations to assist with processing affected traffic. After completing an internal monitoring period, we've validated that impact is remediated. Scope of impact: Admins attempting to access the Microsoft 365 admin center may have been intermittently affected. Start time: Monday, October 5, 2026, at 10:28 PM UTC End time: Monday, October 5, 2026, at 11:37 PM UTC Root cause: An unexpected influx in requests and caused performance degradation and failures for admins attempting to access the Microsoft 365 admin center. Next steps: - We're evaluating what additional performance optimizations or safeguards we can implement to further the resiliency of our service. This is the final update for the event.

Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services. Current status: We're reviewing service monitoring telemetry and associated reports to isolate the root cause, in order to develop a remediation plan. Scope of impact: Impact is specific to users in the United States and United Kingdom attempting to access Microsoft 365 services. This information may be updated as our investigation continues. Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC

Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services. Current status: We're reviewing service telemetry while investigating reports of users encountering 502 and 503 errors when accessing Microsoft 365 services. Recent user reports indicate the impact may be decreasing and we're continuing to analyze service health data to determine whether service conditions are improving and to isolate the source of impact. Scope of impact: Impact is specific to users attempting to access Microsoft 365 services and users whose service requests are routed through the United States and United Kingdom regions. This information may be updated as our investigation continues. Next update by: Wednesday, September 16, 2026, at 3:30 PM UTC

Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services. More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services. Current status: Our investigation remains focused on the cause of the Single Sign-On (SSO) failures and associated 5xx errors. In parallel, we're reviewing upstream dependencies to determine whether they are contributing to the impact. While some affected customers have reported improvement in service availability, our investigation continues as we work towards a full resolution. Start time: Wednesday, September 16, 2026, at 1:22 PM UTC Next update by: Wednesday, September 16, 2026, at 4:30 PM UTC

Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services. More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services. Current status: Impact reports continue to decrease. Our investigation has not identified any issues with core Microsoft 365 components. As part of our ongoing root cause analysis, we're focusing on the request paths and dependency conditions associated with the reported Single Sign-On (SSO) failures and 5xx errors, while continuing to monitor and confirm sustained recovery. Start time: Wednesday, September 16, 2026, at 1:22 PM UTC Next update by: Wednesday, September 16, 2026, at 5:30 PM UTC

Title: Some users in the United States and United Kingdom may be unable to access Microsoft 365 services User impact: Users in the United States and United Kingdom may be unable to access Microsoft 365 services. More info: Impacted users may encounter 502 or 503 errors when attempting to access Microsoft 365 services. Current status: Impact reports have largely subsided, and service telemetry continues to indicate stable service conditions. Our investigation hasn’t identified a corresponding issue within the Microsoft 365 service environment, and we’re assessing whether conditions outside the core service path contributed to the reported impact. We’re continuing to monitor service health and validate sustained recovery. Start time: Wednesday, September 16, 2026, at 1:22 PM UTC Next update by: Wednesday, September 16, 2026, at 6:30 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. Microsoft Purview: Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: Users may experience intermittent authorization failures across solutions in Defender. Current status: We're continuing to perform comprehensive tests to ensure our mitigation strategy effectively resolves the issue without introducing additional impact. In parallel, we're exploring alternative remediation avenues to minimize impact in the interim. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Monday, August 31, 2026, at 8:30 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues with the administration of Exchange Online functionality, such as updating user aliases. Current status: We're reexamining recent changes made to the service to determine why the authentication components aren't being deployed as expected. Additionally, we are exploring every avenue to safely restore the components, including reverting an update the affected infrastructure recently received. We're performing additional tests to determine whether this will provide relief. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start Time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Monday, August 31, 2026, at 10:00 PM UTC

Start Time: Monday, August 31, 2026, at 3:08 PM UTC Next update by: Monday, August 31, 2026, at 11:00 PM UTC Current status: We're continuing our targeted review of affected infrastructure and recent changes made to the service to definitively confirm the cause of impact. We're additionally continuing to test and implement various mitigation strategies to apply the necessary authentication component, which have so far yielded positive results. We're monitoring these tests and mitigative actions closely and will provide an estimated time to resolution as soon as one is available. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. Microsoft Purview: Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: Admins may experience issues authenticating into the admin center. Universal Print: Users may be unable to create, upload, or retrieve print jobs.

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues with the administration of Exchange Online functionality, such as updating user aliases. Current status: We're reexamining recent changes made to the service to determine why the authentication components aren't being deployed as expected. Additionally, we are exploring every avenue to safely restore the components, including reverting an update the affected infrastructure recently received. We're performing additional tests to determine whether this will provide relief. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start Time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Monday, August 31, 2026, at 10:00 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to implement a targeted mitigation to re-apply core authentication components, and we're expanding this action more widely across the affected environments as we closely track the recovery of affected downstream scenarios. Users may notice gradual recovery to the scenarios identified in the "More info" section as our mitigation action takes effect in their corresponding sections of infrastructure, and we're continuing to review whether any additional actions may be required to achieve withstanding recovery across all affected scenarios. We'll provide an estimated time to resolution as soon as one is available. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 12:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're progressively restarting targeted sections of affected infrastructure to ensure the re-applied authentication components are effectively implemented across affected services. We expect this will aid the recovery of affected scenarios. Users should expect delayed delivery of backlogged messages and residual impact across downstream scenarios as these actions are continuing. We'll provide an expected recovery time as soon as one becomes available to us. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 1:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, with Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We’re seeing improvement across the affected environments as we observe the successful albeit gradual implementation of our mitigation actions. Users should expect to see varying degrees of recovery and residual delays until these actions have completed. We're closely monitoring the health of the service environment and will continue to aggressively pursue any available options to expedite our ongoing recovery work, and we'll provide an estimated recovery timeline as soon as one becomes available. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 2:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're closely monitoring the health of the service environment amidst our ongoing recovery work, and we're observing some sections of affected infrastructure which aren't accepting the re-applied authentication components as readily as expected. Users can expect to see continued recovery to email delivery, while users may see residual impact to downstream and dependent scenarios, including search, across affected services. We're working to identify whether any additional actions are required to expedite full recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 3:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. Current status: We're observing residual impact to some downstream scenarios, including search. We're incrementally restarting corresponding instances of infrastructure to ensure our previously applied authentication components are fully saturated, and we're working to identify whether any additional actions are required to achieve resolution. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're observing widespread recovery to Exchange Online mail connectivity, though the draining of backlogged mail queues may take longer for some organizations due to the volume of previously queued messages. Our recovery efforts are now focused on re-applying our targeted authentication component fix and restarting certain instances of infrastructure correlated with search functionality to ensure the full restoration of the associated scenarios. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 5:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're persistently reviewing what additional actions may be required to re-apply our targeted authentication component fix and facilitate the recovery of remaining sections of infrastructure correlated with search functionality to ensure the full remediation. Meantime, we've validated persistent recovery for mail flow across the environment and are focusing our work on recovering search functionality. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 6:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing our work to restart affected infrastructure and re-apply the targeted authentication component fix to recover search functionality across the affected environments. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 7:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: Our efforts to restart affected sections infrastructure and re-apply the targeted authentication component fix has yielded progress, and we're observing incremental improvement reflected in the service health telemetry associated with search functionality across a sample of the affected environment. We're continuing this action for additional sections of infrastructure as we monitor closely to ensure widespread remediation. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 8:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: Reapplying the targeted authentication component fix and restarting affected infrastructure segments has led to measurable progress. We're observing gradual improvements within telemetry data related to search functionality across the remaining affected infrastructure, and we're continuing this remediation effort across additional infrastructure segments while closely monitoring service health telemetry to ensure we're progressing towards a broader recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 9:00 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: -Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. -Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. -Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: -Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: -Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. -Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: -Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: -Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: -Admins may experience issues authenticating into the admin center. Universal Print: -Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to reapply the targeted authentication component fix to the remaining affected infrastructure where necessary. While our remediation effort is underway, indications from service telemetry remain positive. We're observing an overall increase in service availability, and we're monitoring this closely to ensure we're progressing towards a broad mitigation. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 10:00 AM UTC

More info: More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: - Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: - Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to apply the targeted authentication component fix across the remaining affected infrastructure where necessary. Service telemetry continues to indicate recovery, with availability increasing across previously impacted scenarios as remediation progresses. We're validating that authentication, connectivity and search operations are returning to expected service levels while monitoring for any residual impact and confirming that the remediation is delivering broad mitigation across affected Exchange Online scenarios. As recovery signals continue to trend positively, we're maintaining extended monitoring across affected service workflows to ensure improvements are sustained. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 PM UTC

More info: More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: - Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: - Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to apply the targeted authentication component fix across the remaining affected infrastructure where necessary. Service telemetry continues to indicate recovery, with availability increasing across previously impacted scenarios as remediation progresses. We're validating that authentication, connectivity and search operations are returning to expected service levels while monitoring for any residual impact and confirming that the remediation is delivering broad mitigation across affected Exchange Online scenarios. As recovery signals continue to trend positively, we're maintaining extended monitoring across affected service workflows to ensure improvements are sustained. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 PM UTC

More info: More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: - Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: - Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Current status: We're continuing to apply the targeted remediation across the remaining affected infrastructure where needed. Service telemetry continues to show positive recovery trends, with availability improving across previously impacted scenarios. We're actively validating that authentication, connectivity, and search experiences are returning to expected service levels, while maintaining enhanced monitoring to ensure improvements are sustained and any residual impact is addressed. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft Purview: - Users may face intermittent authorization failures across solutions in Purview. Purview admins can’t access the portal. Additionally, in Microsoft Purview Communication Compliance, users may see errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies. Communication Compliance policy creation and evaluation may be delayed. Microsoft Defender XDR: - Users may experience intermittent authorization failures across solutions in Defender. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Current status: Service telemetry continues to indicate recovery across previously impacted scenarios as remediation progresses through the remaining affected infrastructure. Core Exchange Online experiences, including mail flow and search functionality, have recovered. Our focus has shifted toward validating recovery across remaining Microsoft 365 services. We're actively monitoring service health, assessing any residual pockets of impact, and confirming end-to-end functionality across affected workloads. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 5:00 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Current status: We've observed continued recovery across previously impacted Exchange Online scenarios, with core mail flow functionality remaining healthy. Our focus remains on validating recovery across dependent Microsoft 365 experiences and confirming that remaining impact scenarios are fully addressed. We're maintaining enhanced monitoring while engineering teams complete end-to-end validation before determining whether any further corrective actions are required. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 6:00 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with calendar functionality and search. Users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph:- Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Current status: We are carefully implementing corrective actions while maintaining enhanced monitoring to ensure services remain stable as recovery progresses. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 7:00 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft Teams: - Users may experience issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may fail. - Microsoft Teams Room (MTR) devices and desktop phones display as offline in the Teams admin center. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Current status: We’re continuing to advance multiple workstreams to restore service and prevent additional impact. We’re prioritizing infrastructure that requires the most immediate attention while carefully expanding corrective actions across additional regions, with continued monitoring throughout this process. In parallel, we’re investigating remaining reports of impact and evaluating additional actions to support full service recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 10:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may be unable to connect to Exchange Web Services (EWS) Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Current status: Most users should see recovery across the majority of impacted scenarios, though some scenarios will remain degraded until our mitigation efforts are complete. We're continuing to progress our mitigation efforts across multiple workstreams as we work to restore the service to healthy levels. We understand the challenges incidents such as these have on your organization and we’ll continue to closely monitor service health and prevent further impact. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 1:30 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may be unable to connect to Exchange Web Services (EWS) Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Current status: We're continuing to closely monitor service health as we carefully expand our reiterative corrective actions across additional regions. This work involves re-deploying our targeted fixes to the dependent authentication components to ensure service resilience, while balancing ongoing traffic patterns to avoid additional residual impact. Most users should see recovery across the majority of impacted scenarios, though some scenarios, including those reliant on Graph API and Representational State Transfer (REST) connection methods, will remain degraded until our mitigation efforts are complete. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 3:30 AM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may be unable to connect to Exchange Web Services (EWS) Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Current status: Based on our telemetry, we expect a small subset of users may still see impact across the listed scenarios, though we're continuing our work to balance the implementation of our fixes across the infrastructure to achieve withstanding recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 4:30 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may be unable to connect to Exchange Web Services (EWS) - Users may be unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Current status: Based on our telemetry, we expect a small subset of users may still see impact across the listed scenarios, though we're continuing our work to balance the implementation of our fixes across the infrastructure to achieve withstanding recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 4:30 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may be unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may be unable to connect to Exchange Web Services (EWS) - Users may be unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may experience issues authenticating into the admin center. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. Resolved Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Current status: Our telemetry indicates service availability remains stable above 99 percent, and we expect the majority of users should no longer be seeing impact from this issue. Our continued focus is on balancing the implementation of our fixes across remaining portions of affected infrastructure to ensure persistent recovery, with added attention on ensuring withstanding recovery of scenarios dependent on REST and Graph API connection methods. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 4:30 PM UTC

More info: More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. Microsoft Graph: - Users may experience failures for scenarios that rely on access to Exchange Online data. *RECOVERED* Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. - Users may experience failures for scenarios that rely on access to Exchange Online data. - Users prompts may fail or they may experience degradation when utilizing Cowork. Current status: We're continuing to observe positive recovery trends across the affected environments, with service availability remaining stable above 99 percent. Based on our telemetry, we expect the vast majority of previously impacted users should no longer be experiencing issues related to this event. Our deployment activities are progressing as expected, and we're continuing to implement the remaining portions of our remediation across affected infrastructure to help ensure recovery is sustained over time. We remain focused on validating end-to-end service health, monitoring for any residual impact, and confirming that recovery is maintained for scenarios that rely on REST and Graph API connection methods. While a small subset of users may still encounter intermittent impact as the deployment continues to progress, current telemetry indicates continued improvement and no signs of broader service degradation. We're maintaining enhanced monitoring and will provide further updates as recovery work continues. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 4:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displaying as offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. Current status: Service availability remains stable above 99%, and telemetry indicates sustained recovery across the affected environments. The primary remediation has been deployed across the majority of impacted infrastructure, with remaining deployment and validation activities progressing as expected. Most previously affected users should no longer experience issues related to this event, though a small subset may continue to see intermittent impact while final recovery validation is completed. Our remaining efforts are focused on validating sustained recovery and identifying any remaining infrastructure requiring remediation. Enhanced monitoring remains in place as we continue recovery validation activities. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 5:30 PM UTC

More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. OneDrive for Business and SharePoint Online: - Users may be unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may see partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may be unable to create, upload, or retrieve print jobs. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. Current status: We’re working on additional mitigation measures for the portion of infrastructure which have not yet returned to healthy service levels after deployment of our primary remediation. Service availability remains above 99 percent and our monitoring shows impact is resolved for the majority of users. We remain engaged and committed to fully resolving this issue for all users. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 6:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We've confirmed that impact related to OneDrive for Business, SharePoint Online, and Universal Print are now resolved. We recognize that while the majority of services are restored for most users, the remaining issues are disruptive for those still impacted. We're continuing to address residual impact with the highest priority so we can ensure resolution for all users. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 8:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: The majority of services are restored for most users, and we continue to observe broad service recovery. We recognize that some users may still experience residual impact, and addressing these remaining scenarios continues to be our highest priority. We’re actively progressing our mitigation efforts and closely monitoring service health as we work to ensure full recovery for all users. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Wednesday, September 2, 2026, at 10:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - Additionally, in Microsoft Purview Communication Compliance, users may have experienced errors when loading Communication Compliance policies and Data Loss Prevention (DLP) policies, and policy creation or evaluation delays. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We continue to see sustained recovery across the affected services, with most users no longer experiencing impact. We’re continuing to focus on the remaining areas of impact and are progressing our mitigation efforts to address these residual scenarios. We’re closely monitoring service health throughout this work to maintain stability. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 12:30 AM UTC

More info: Impact is currently limited to Microsoft Outlook on the web. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From Purview Communications compliance perspective, this issue is mitigated. Customers should be able to use the portal. We are running backfill for any missed policy hits and those should appear in the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We're continuing to closely monitor the service to ensure sustained stability, and signals from telemetry and customer feedback remain positive. In parallel, we're conducting additional remediation actions where required to resolve any lingering residual impact. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 10:30 AM UTC

More info: Impact is currently limited to Microsoft Outlook on the web. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We're continuing to closely monitor the service to ensure sustained stability, and signals from telemetry and customer feedback remain positive. In parallel, we're conducting additional remediation actions where required to resolve any lingering residual impact. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 10:30 AM UTC

More info: Impact is currently limited to Microsoft Outlook on the web. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We're performing additional remediation efforts where necessary to address any remaining impact from this incident. Reports from telemetry data and customer feedback are aligned, indicating a sustained recovery. We're actively monitoring the situation closely to ensure impact is completely mitigated. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 12:30 PM UTC

More info: Impact is currently limited to Microsoft Outlook on the web. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We're continuing to implement further mitigation actions where required to resolve any outstanding impact associated with this incident. Customer feedback and reports from our telemetry remain positive, and service health is stable. While this work is underway, we're actively monitoring the service closely to ensure stability is consistent. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 2:30 PM UTC

More info: Impact is currently limited to Microsoft Outlook on the web. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods are affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: While monitoring service telemetry closely, we identified a small volume of errors affecting mail flow functionality. We're conducting targeted restarts to reduce the number of errors and alleviate impact. In parallel, we're continuing to analyze service health telemetry to determine if any additional mitigation actions are required to restore normal functionality. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 4:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact is currently limited to Outlook on the web, Outlook mobile apps, and Outlook for Mac. Previously identified impact included the services and scenarios listed below. We will continue to update this list as our investigation progresses and our understanding of the issue evolves. Exchange Online: - Users can't download email message attachments through any Exchange Online connection method. - Users may be unable to sign in to Outlook on the web. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods were affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: We discovered an issue in less than one percent of our infrastructure, where our additional mitigation efforts to resolve impact for Exchange Online did not successfully deploy. The vast majority of impact remains remediated; however, those serviced from the impacted portion of infrastructure may be unable to access previously recovered Outlook connection methods. We remain committed to restoring all services to all users and will continue to carefully monitor our telemetry to ensure recovery. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Thursday, September 3, 2026, at 6:30 PM UTC

User impact: Users may experience issues when utilizing multiple Microsoft 365 services. More info: Impact is now fully resolved. Previously identified impact included the services and scenarios listed below. RECOVERED Microsoft Graph: - Users may have experienced failures for scenarios that rely on access to Exchange Online data. Exchange Online: - Service telemetry indicates recovery of core mail flow and search functionality. - Service telemetry indicates recovery of the majority of previously impacted authentication and protocol connectivity scenarios. - Users may have been unable to connect to, or experience degraded functionality, such as failures when attempting to use the search function, within Exchange Online. All connection methods were affected. - Users may have been unable to connect to Exchange Web Services (EWS) - Users may have been unable to use room finder in Outlook calendars. - Users couldn’t download email message attachments through any Exchange Online connection method. - Users may have been unable to sign in to Outlook on the web. Outlook for iOS and Android: - Users may have experienced delays or failures when sending or receiving email messages via Outlook for iOS and Android. Microsoft 365 Admin Center: - Admins may have experienced issues authenticating into the admin center. Microsoft Purview: - Users can now access the Microsoft Purview portal. - Any policy hits, alerts, or processing activities delayed during the event are expected to appear over the next 24 to 48 hours as recovery validation continues. - From a Microsoft Purview Communication Compliance perspective, the issue has been mitigated and customers should now be able to access and use the portal as expected. We are currently processing any policy activity that may have been delayed during the event, and any missed policy hits, alerts, or related results are expected to appear within the next 24 to 48 hours. Microsoft Defender XDR: - Users may have experienced intermittent authorization failures across solutions in Defender. Microsoft Teams: - Users may have experienced issues with search and users’ presence may be stale and not update automatically or through manual adjustment. User location adjustment may have failed. - Users may have experienced issues with Microsoft Teams Room (MTR) devices and desktop phones displayed offline in the Teams admin center. - Users may have experienced issues creating, deleting, and editing Teams channels. - Users may have experienced issues with calendar functionality. Microsoft 365 Copilot: - Users' Copilot prompts that required Microsoft 365 grounding, such as email content, may have failed. - Users may have experienced failures for scenarios that rely on access to Exchange Online data. - Users prompts may have failed or they may have experienced degradation when utilizing Cowork. OneDrive for Business and SharePoint Online: - Users may have been unable to load or refresh portions of OneDrive and SharePoint, including account and storage information, search results, Favorites, Followed and Shared With Me content, recent files, lists, and news. - Some users may have also experience delayed or failed file opening, Office policy-label retrieval, OneDrive synchronization, mobile camera upload, and video playback. - Users may have seen partial page failures, missing or stale content, repeated retries, and operation timeouts rather than a complete platform outage. Universal Print: - Users may have been unable to create, upload, or retrieve print jobs. Current status: All user impact scenarios are now resolved as we rectified the additional mitigation efforts for the Outlook impact which occurred in less than one percent of our infrastructure. We will continue to monitor our telemetry to ensure all services remain healthy and plan to close this communication by our next scheduled update. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Friday, September 4, 2026, at 6:30 PM UTC