Microsoft is continuing to work through multiple recovery options, as the steps taken so far have not restored service as expected.
Their investigation has identified a core process on affected servers becoming overloaded, causing servers to stop responding and reducing overall service capacity.
Microsoft is now testing a recovery approach that involves isolating part of the infrastructure, restarting affected components, and gradually restoring traffic to confirm stability before applying the approach more broadly. They are also evaluating whether isolating traffic by region could help affected regions recover independently.
Posted Nov 12, 2026 - 14:38 PST
Update
Microsoft has successfully tested a change that is allowing some affected servers to return to service and is now applying that change more broadly. They are also implementing an automated recovery process to detect and restart unresponsive servers while restoration efforts continue. Microsoft is additionally reviewing a small number of recent configuration changes that may have contributed to the issue.
Posted Nov 12, 2026 - 13:26 PST
Update
Microsoft is actively working to restore service. The issue is related to a large number of servers becoming unexpectedly unavailable, which is placing additional load on the remaining infrastructure. Microsoft has paused deployments and configuration changes while they investigate the cause and safely bring affected servers back online.
Posted Nov 12, 2026 - 12:21 PST
Identified
Microsoft has identified connectivity errors occurring on a portion of Exchange Online infrastructure which receives and processes users’ access requests. They are collected networking logs to review to further investigate the source of these errors and confirm our next steps.
Posted Nov 12, 2026 - 10:37 PST
Investigating
Microsoft is currently experiencing a service issue affecting Exchange Online. Some users may experience delays or difficulties accessing email and related services.
Microsoft is actively investigating. IT is monitoring the situation and will provide updates as more information becomes available.
Posted Nov 12, 2026 - 10:13 PST
This incident affects: Microsoft 365 Services (Outlook, Teams, SharePoint, and OneDrive).