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Microsoft 365 Massive Outage – Fixes Fail as Restored Servers Keep Going Unresponsive
Matched: health
A Microsoft 365 outage exceeding 10 hours continues as restored servers repeatedly fail under user traffic load. Beginning November 12, 2026, the disruption spread from Exchange Online to Teams, SharePoint, Copilot, and Defender across all regions. Microsoft is rebuilding servers on previous configurations, limiting traffic, and rerouting load while analyzing root cause. Over 120,000 Outlook reports peaked across 74 countries. No cyberattack is involved.
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.
Microsoft Investigation Teams Issue Affecting Users in the United States
Matched: health
Microsoft restored Teams service after an outage affecting some US users on October 26, 2026, tracked under incident TM1526111. Automated scaling efforts increased processing throughput and returned the service to normal. The cause was not publicly identified, nor were affected user counts or specific features named. Administrators can review incident details in the Microsoft 365 admin center.