A global Microsoft 365 outage disrupted Outlook email and some Teams features. Microsoft said a patch had improved stability on some servers, but it was still deploying the fix more widely and gave no timetable for restoration. Some users could not access Exchange Online mailboxes; Microsoft said most Teams calls and chats continued to work.
Microsoft attributed the outage to an overloaded process that handles secure connections and said there was no indication of a security breach. OpenAI reported errors in ChatGPT’s Microsoft 365 connector, while Anthropic said most email, calendar and search requests through Claude’s connector failed. Government offices in the United States, Japan and Singapore also reported email disruptions.
