[Microsoft 365 Suffers Massive Outage, Outlook, Teams, and Other Services Affected for Over 6 Hours]
On November 13th, Microsoft 365 experienced a massive outage starting around 1:54 AM. Initially, users in the Americas were unable to access Exchange Online mailboxes, and Microsoft subsequently confirmed that users worldwide were affected. Affected services include Outlook.com, OneDrive, OneNote, To Do, Teams, and the web version of Microsoft 365. The outage lasted for over 6 hours and was classified as "service degraded."
Microsoft stated that the outage was caused by a large number of servers unexpectedly becoming unresponsive, leading to excessive infrastructure load. Overloaded core processes on affected servers caused capacity loss. Microsoft has paused deployments, restarted servers, and diverted traffic.
Servers that had been restored by Microsoft became unresponsive again after resuming traffic. Microsoft is currently analyzing diagnostic data, restricting traffic types in some regions, and rebuilding some servers with older configurations. Microsoft expects to release the next update before 12:30 PM.
