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
Posted Jan 22, 2026 - 15:52 EST
This incident affected: Microsoft 365 Applications.