Microsoft 365 outage disrupts Outlook and Teams worldwide
A global Microsoft 365 outage continued into Friday, affecting Outlook email, Exchange Online mailboxes and several Teams functions. The disruption began on Thursday after an overloaded process responsible for secure connections caused some servers to stop processing requests. Users in businesses and government agencies were unable to access email and calendars, while Teams users reported problems scheduling meetings and sending invitations. Most Teams calls and chats continued to function.
Microsoft said at 7:25 a.m. UTC on Friday that a patch had improved stability on some servers and that engineers were expanding the rollout, although it did not provide a timetable for full recovery. The company also tried restarting infrastructure, redirecting network traffic and adding server capacity. It said there was no indication of a security breach.
The incident affected Microsoft Copilot and Defender for Office 365, as well as external AI services that depend on Microsoft 365 account access. OpenAI reported errors with ChatGPT’s Microsoft 365 connector, while Anthropic said most email, calendar and search requests through Claude’s connector failed. The US Court of Appeals for the Tenth Circuit said its clerk’s office could not send or receive email for much of Thursday. Japan’s Finance Ministry and Singapore’s Government Technology Agency also reported affected government email systems. Microsoft said in an October filing that Microsoft 365 has more than 450 million paid commercial seats worldwide.
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