rewindex

CompaniesAnthropicIncidents

Anthropic: Elevated errors affecting the Microsoft 365 connector

MajorStatus: identifiededitedStarted Not resolved5 updatesstatus.claude.com (opens in new tab)

Affected components: claude.aiClaude Cowork

Timeline of updates

  1. investigating

    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.

  2. identified

    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.

  3. identified

    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

    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.

  5. identified

    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 (opens in new tab). We will update this post when service is restored.

Changes Rewindex caught on this incident

Archive proof

Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves these records existed by then and have not been changed since, by anyone, Rewindex included.

How the archive is checked, and what it cannot prove.

Impact, status and times are the vendor’s own, as last archived. View on status.claude.com (opens in new tab).

Cite this

Status incident (vendor impact label: major) posted by Anthropic, started 2026-11-12 17:52 UTC, not resolved, 5 update(s); edited after publishing.

Title
Elevated errors affecting the Microsoft 365 connector
Vendor
Anthropic
Date
URL
https://rewindex.com/company/anthropic/incidents/sqn3fg1l96dl

Anthropic profileRecent Anthropic incidentsAll outages on November 12, 2026Anthropic in November 2026MarkdownJSON