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Outage in Anthropic

Elevated errors affecting the Microsoft 365 connector

Major
November 12, 2026 - Started about 19 hours ago
Official incident page

Incident Report

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.
Components affected
Anthropic claude.ai

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Latest Updates ( sorted recent to last )
IDENTIFIED about 15 hours ago - at 11/12/2026 10:23PM

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.

IDENTIFIED about 16 hours ago - at 11/12/2026 09:18PM

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.

IDENTIFIED about 17 hours ago - at 11/12/2026 08:28PM

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.

IDENTIFIED about 19 hours ago - at 11/12/2026 06:34PM

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.

INVESTIGATING about 19 hours ago - at 11/12/2026 05:52PM

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.

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