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Anthropic · AINov 12, 2026, 17:52 UTC yesterday

Elevated errors affecting the Microsoft 365 connector

MajorNot disclosedUpdated 9h ago
Nov 12, 17:52 UTCOngoing
Duration
Ongoing
Impact
Major
Root cause
Not disclosed
Anthropic, 90 days
45 incidents
Affected
claude.aiClaude Cowork
Status page

Final update

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.

Timeline

  1. Identified · Nov 12, 22:23 UTC
    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.
  2. Identified · Nov 12, 21:18 UTC
    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.
  3. Identified · Nov 12, 20:28 UTC
    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.
  4. Identified · Nov 12, 18:34 UTC
    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.
  5. Investigating · Nov 12, 17:52 UTC
    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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