Microsoft outage: Failed server health checks disrupt Microsoft 365 globally

Microsoft is experiencing a worldwide outage affecting Microsoft 365 consumer and business products, including Outlook, Teams, and Copilot, after servers failed automated health checks and went offline. The disruption began November 12 and continued into November 13. Microsoft attributed the issue to servers that failed health checks, causing their traffic to overload remaining infrastructure and create connectivity errors. The company stated the load was not from increased overall traffic, and there is no indication of a cyberattack. Microsoft has rebooted affected servers and redistributed traffic, reporting partial recovery in some regions, but has not provided a final root cause or full restoration timeline. Both consumer and enterprise status pages still show service degradation.