1/22/2026 - Degraded Performance - Microsoft 365

Update timeline

1. investigating Jan 22, 2026, 08:52 PM UTC

   Users may be seeing degraded service functionality or be unable to access multiple Microsoft 365 services. More info: More info: 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

2. resolved Jan 24, 2026, 04:40 PM UTC

   This incident has been resolved.