Microsoft 365 outage hits Outlook email and Teams calendars worldwide
A global Microsoft 365 outage continued into Friday, disrupting Outlook email and some Teams features as the company worked to deploy a patch fix.
Microsoft began a wider patch rollout Friday as the outage disrupted government email and Microsoft 365 connectors in ChatGPT and Claude. The company said in a 7:25 am UTC update that a patch had improved stability on some servers and that it was working to deploy the fix more widely, though it gave no timetable for full restoration.
Root Cause
The outage began Thursday, leaving some users unable to access their Exchange Online mailboxes. Microsoft said a process that handles secure connection became overloaded, causing affected servers to stop processing requests. The company attempted to restore services by restarting infrastructure, redirecting network traffic and expanding server capacity, while confirming there was no indication of a security breach.
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