Elevated errors affecting the Microsoft 365 connector

Summary

Elevated errors affecting the Microsoft 365 connector

This incident has been resolved. From 08:03 PT / 16:03 UTC on November 12 to 08:40 PT / 16:40 UTC on November 13, mail, calendar and search tools in the Microsoft 365 connector and Claude for Outlook returned errors for many requests because of a Microsoft 365 service incident. Microsoft is still completing its recovery, so you may see occasional errors or delays.

• Started

  Nov 12, 2026 · 5:52 PM

• Resolved

  Nov 13, 2026 · 9:49 PM

• Duration

  1d 3h 57m

• Severity

  Major

• ◐

  Investigating

  Nov 12 · 5:52 PM Claude

  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.

• ◆

  Identified

  Nov 12 · 6:34 PM Claude

  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.

• ◆

  Identified

  Nov 12 · 8:28 PM Claude

  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

  Nov 12 · 9:18 PM Claude

  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

  Nov 12 · 10:23 PM Claude

  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.

• ◉

  Monitoring

  Nov 13 · 3:40 PM Claude

  We're seeing signs of recovery for the Microsoft 365 connector. Claude for Outlook is also recovering. Some SharePoint search requests are still returning errors. Microsoft's incident remains open, so errors may return. We're continuing to monitor and will update this post as soon as we have more info.

• ✓

  Resolved

  Nov 13 · 9:49 PM Claude

  This incident has been resolved. From 08:03 PT / 16:03 UTC on November 12 to 08:40 PT / 16:40 UTC on November 13, mail, calendar and search tools in the Microsoft 365 connector and Claude for Outlook returned errors for many requests because of a Microsoft 365 service incident. Microsoft is still completing its recovery, so you may see occasional errors or delays.