Current status: We've validated an alternative health check method on a subset of affected infrastructure, which allowed the servers in that subset to successfully return to service, and we're now applying this change more broadly. We're also preparing an automated recovery process to continually detect and restart unresponsive servers, to help keep them in service while this change progresses. Additionally, our review of recent changes has identified a small number of configuration updates that we're investigating as potential contributors to the issue.
Posted Nov 12, 2026 - 16:38 EST
Investigating
Current status: Microsoft has validated an alternative health check method on a subset of affected infrastructure, which allowed the servers in that subset to successfully return to service, and we're now applying this change more broadly. Microsoft is also preparing an automated recovery process to continually detect and restart unresponsive servers, to help keep them in service while this change progresses. Additionally, Microsoft has a review of recent changes has identified a small number of configuration updates that we're investigating as potential contributors to the issue.
Posted Nov 12, 2026 - 13:14 EST
This incident affects: Microsoft 365 - Outlook/Teams/Sharepoint/OneDrive.