Microsoft 365 outage disrupts Outlook, Teams, and Copilot for users worldwide

A global Microsoft 365 outage has disrupted Outlook, Teams, SharePoint Online, and Copilot for users worldwide, with recovery ongoing after more than eight hours. Microsoft is working to restore affected servers, though no root cause or full restoration timeline has been provided. The disruption began Thursday afternoon US time, affecting users in the US, UK, Japan, Singapore, and Australia. Downdetector reports for Outlook peaked near 140,000 globally. Microsoft attributed the issue to a large number of servers becoming unavailable without warning, causing elevated load on remaining systems, and clarified it was not due to increased traffic. Microsoft has validated an alternative health check method, allowing a subset of servers to return to service, and is rerouting traffic where possible. The outage is limited to enterprise products, not consumer services, and messaging and online meetings are largely working.