Microsoft 365 Email Delivery Interruption

Update timeline

1. monitoring Jan 22, 2026, 08:30 PM UTC

   Customers utilizing a Microsoft 365 tenant for email services may experience delays or intermittent failures when sending or receiving email. At this time, the issue appears to be related to Microsoft 365 services and is not the result of any outage or recent change within the Trimble hosted environment. Although Microsoft has not yet published an official service advisory, we are observing behavior consistent with a broader Microsoft-side service disruption. Customers utilizing the Trimble Transportation Enterprise SMTP Relay services are not affected by this issue. We are actively monitoring the situation and have engaged Microsoft Support for additional visibility. At this time, Microsoft has not provided an estimated time to resolution. Further updates will be shared as additional information becomes available.

2. investigating Jan 22, 2026, 08:30 PM UTC

   Customers utilizing a Microsoft 365 tenant for email services may experience delays or intermittent failures when sending or receiving email. At this time, the issue appears to be related to Microsoft 365 services and is not the result of any outage or recent change within the Trimble hosted environment. Although Microsoft has not yet published an official service advisory, we are observing behavior consistent with a broader Microsoft-side service disruption. Customers utilizing the Trimble Transportation Enterprise SMTP Relay services are not affected by this issue. We are actively monitoring the situation and have engaged Microsoft Support for additional visibility. At this time, Microsoft has not provided an estimated time to resolution. Further updates will be shared as additional information becomes available.

3. monitoring Jan 22, 2026, 08:51 PM UTC

   Microsoft has confirmed this issue is related to their infrastructure and is not related to Trimble infrastructure or services. We have included the Microsoft official statement regarding the disruption below For the most up-to-date information and status updates, please refer to the Microsoft 365 Service Health Status page: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect We will continue to monitor the situation and share updates as they become available. From Microsoft: Users may be receiving a "451 4.3.2 temporary server issue" error message when attempting to send or receive email through Outlook. Some of the impacted service functions include, but may not be limited to: - Sending and receiving email through Exchange Online, including notification emails from Microsoft Viva Engage. - Collecting message traces may be delayed or fail. - Searches within SharePoint Online and/or Microsoft OneDrive mail be delayed or fail to complete. - Accessing the service portals, including Microsoft Purview, Microsoft Defender XDR, and the Microsoft 365 admin center. Current status: We're continuing to review what actions are required to restore the affected infrastructure to a heathy state and rebalance the service traffic to achieve recovery. Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected. Next update by: Thursday, January 22, 2026, at 11:00 PM UTC

4. investigating Jan 22, 2026, 08:51 PM UTC

   Microsoft has confirmed this issue is related to their infrastructure and is not related to Trimble infrastructure or services. We have included the Microsoft official statement regarding the disruption below For the most up-to-date information and status updates, please refer to the Microsoft 365 Service Health Status page: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect We will continue to monitor the situation and share updates as they become available. From Microsoft: Users may be receiving a "451 4.3.2 temporary server issue" error message when attempting to send or receive email through Outlook. Some of the impacted service functions include, but may not be limited to: - Sending and receiving email through Exchange Online, including notification emails from Microsoft Viva Engage. - Collecting message traces may be delayed or fail. - Searches within SharePoint Online and/or Microsoft OneDrive mail be delayed or fail to complete. - Accessing the service portals, including Microsoft Purview, Microsoft Defender XDR, and the Microsoft 365 admin center. Current status: We're continuing to review what actions are required to restore the affected infrastructure to a heathy state and rebalance the service traffic to achieve recovery. Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected. Next update by: Thursday, January 22, 2026, at 11:00 PM UTC

5. monitoring Jan 23, 2026, 06:27 AM UTC

   Microsoft has confirmed the previously reported email delivery issues related to Microsoft 365 infrastructure have been resolved. The issue was not related to Trimble infrastructure or services , and no impact was identified within the Trimble hosted environment. Email delivery for customers utilizing Microsoft 365 tenants should now be operating normally. We will continue to monitor service health and will provide additional updates if necessary.

6. resolved Jan 23, 2026, 06:27 AM UTC

   Microsoft has confirmed the previously reported email delivery issues related to Microsoft 365 infrastructure have been resolved. The issue was not related to Trimble infrastructure or services, and no impact was identified within the Trimble hosted environment. Email delivery for customers utilizing Microsoft 365 tenants should now be operating normally. We will continue to monitor service health and will provide additional updates if necessary.