Anthropic reported this major-impact incident on its official status page on Nov 12, 2026, 17:52 UTC. It has not been marked resolved yet.
Right now Anthropic is degraded. Live Anthropic status →
This issue is caused by a Microsoft 365 service incident, and mail, calendar and search tools in the Microsoft 365 connector are still failing for most requests. Claude for Outlook remains affected. You can follow Microsoft's progress at https://status.cloud.microsoft. We will update this post when service is restored.
We are continuing to work with our upstream provider, who is restarting affected servers. Mail, calendar and search tools in the Microsoft 365 connector are still failing for most requests, and Claude for Outlook remains affected. We will provide another update as soon as we have more information.
We are continuing to work with our upstream provider on this issue. Mail, calendar and search tools in the Microsoft 365 connector are still failing for most requests. Claude for Outlook is also affected: mail and calendar actions may fail, and some users may not be able to open the add-in. We will provide another update within the hour.
We have identified an issue with an upstream provider affecting the Microsoft 365 connector. Mail, calendar and search tools are failing for most requests, and new connections to the connector may not complete. We are in contact with them and will provide an update as soon as possible.
We are investigating elevated errors and slow responses affecting the Microsoft 365 connector. Requests to mail, SharePoint, Teams chat and calendar through the connector may fail, and new connections to the connector may not complete. We will provide an update as soon as possible.
Overlapping incidents aren't necessarily related.
Anthropic reported 42 incidents in the last 90 days, 24 of them major or critical. A typical incident lasted 1h 2m. See Anthropic's uptime and incident history