SoftwareNov 13, 2026, 4:20 AM UTC·1 min read

Microsoft 365 outage hits Teams, Exchange Online and Copilot

A Microsoft 365 outage is disrupting Teams, Exchange Online, SharePoint, Copilot and Defender XDR for users around the world, with server failures behind it.

A office worker looks at a laptop showing an error message while a Microsoft Teams window fails to load. — Image: heise online

If Teams won't load and your mail has gone quiet, it is probably not your network. Microsoft 365 is having a worldwide outage, and several of its biggest cloud services are affected at once.

Which Microsoft 365 services are down?

The disruption affects Exchange Online, Teams, SharePoint, Copilot and Defender XDR, Microsoft's security tool for detecting and responding to attacks. The cause is server failures on Microsoft's side, and the problems are not limited to one region.

That combination matters. Exchange handles mail and calendars, Teams handles chat and meetings, and SharePoint holds shared files. When they stumble together, a lot of office work stalls at once. The Defender XDR problems are a separate worry for IT teams, because it is the tool they would normally use to watch for trouble.

What can you do about it?

For ordinary users, there is little to do except wait. This is a fault in Microsoft's infrastructure, so restarting the app or switching Wi-Fi is unlikely to help. Administrators can check the service health page in their Microsoft 365 admin center for status updates.

The available information does not say what exactly failed, how many customers are affected or when everything will be back. Those details are not confirmed yet.

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Tags:microsoft 365outageteamsexchange onlinecopilotsharepoint