Resolved -
Microsoft has confirmed that the underlying issue has been resolved and service has been fully restored to all affected customers and regions.
Nov 14, 07:58 PST
Update -
Microsoft is reporting broad recovery and improved stability across its email services, with restoration efforts continuing for the remaining affected customers and regions.
Microsoft has confirmed that the outage was caused by a technical issue related to an earlier network capacity upgrade, which surfaced following a recent network change. The incident was not related to a cyberattack or AI systems.
The underlying issue has been addressed, and Microsoft is gradually restoring remaining services while monitoring stability. A full post-incident report will be provided once their investigation is complete.
Nov 13, 11:52 PST
Monitoring -
Microsoft continues to make progress restoring Exchange Online services, with significant improvements reported across North America and Europe, and encouraging signs of recovery in Asia Pacific.
Some users may still experience intermittent access issues or delays in email delivery as Microsoft works to restore the remaining affected infrastructure and clear email backlogs.
Microsoft is closely monitoring service stability and working toward full recovery. There is currently no evidence of malicious activity associated with this incident.
Nov 13, 06:01 PST
Update -
Microsoft is increasing infrastructure capacity where possible to better support traffic as affected regions begin returning to service. They are continuing to monitor the impact of these changes and identify additional actions that can improve service stability across all affected regions.
Nov 12, 18:22 PST
Update -
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.
Nov 12, 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.
Nov 12, 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.
Nov 12, 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.
Nov 12, 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.
Nov 12, 10:13 PST
