# Anthropic: Elevated errors affecting the Microsoft 365 connector

> Anthropic reports elevated errors and slow responses that affect the Microsoft 365 connector on claude.ai and Claude Cowork. Mail, calendar and search tools fail for most requests, and new connections to the connector may not complete. Anthropic identified an issue with an upstream provider and continues to work on it.

- Provider: [Anthropic](https://outages.live/anthropic.md)
- Type: Incident
- State: identified
- Worst impact: Partial outage
- Started: 2026-11-12 17:52 UTC
- Components: claude.ai, Claude Cowork
- Official update: https://stspg.io/m0rbx38nmy1c

## Updates from Anthropic

### identified, 2026-11-12 18:36 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.

### investigating, 2026-11-12 17:54 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.