A global outage impacted Microsoft 365 services including Outlook, Teams, and Copilot, according to reports from November 12-13. More than 130,000 reports of Outlook-related problems in the U.S. were recorded on November 12, with additional disruptions affecting Microsoft 365, Teams, and Copilot, as tracked by Downdetector. Microsoft confirmed ongoing recovery efforts to restore normal service availability.
Microsoft identified two service incidents, EX1550543 and MO1550821, related to mailbox connectivity and broader Microsoft 365 disruptions. Affected services included Outlook, Teams, Copilot, SharePoint Online, and Microsoft Defender XDR. While core Teams functionality remained operational for many users, Exchange Online-dependent features such as calendar management may face failures. Microsoft extended email timeout windows to 48 hours to address delayed messages.
Microsoft attributed the outage to unexpected server unavailability rather than high user traffic, with engineers restarting servers and redistributing network traffic. Recovery progress was reported in North America and Europe, though some users may still experience intermittent access issues. The company stated no evidence of malicious activity and did not provide a full restoration timeline.