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Massive Microsoft 365 Outage Impacts Exchange Online, Teams, SharePoint, Copilot, and Defender XDR Users
Matched: health
A major Microsoft 365 outage beginning November 12, 2026 disrupted Exchange Online, Teams, SharePoint, Copilot, and Defender XDR globally. Microsoft attributed the failure to servers unexpectedly going offline, overloading remaining infrastructure. Failed automated health checks complicated recovery, with restored servers becoming unresponsive under traffic load. Engineers rerouted traffic and explored configuration rollbacks. Full restoration had not been confirmed. Administrators should monitor incidents MO1550821 and EX1550543 in the Microsoft 365 admin center.