# Claude outage on 12 November 2026

> On 12 November, Claude's Microsoft 365 connector and Claude for Outlook had errors: mail, calendar and search tools failed for many requests. The incident was open from 17:52 UTC on 12 November to 21:49 UTC on 13 November, but the status page's final update put the impact from 16:03 UTC on 12 November to 16:40 UTC on 13 November, attributed it to a Microsoft 365 service incident, and noted that occasional errors might continue. Other services, including GoDaddy, OpenAI, Greenhouse, Litmus, U-Haul and GitHub, also reported problems at the same time.

- Service: [Claude](https://stackpulse.app/services/claude.md)
- Severity: major_outage
- Title on the status page: Elevated errors on claude.ai, the Claude API, and Claude Code
- Started: 2026-11-12 17:53 UTC
- Ended: 2026-11-13 21:50 UTC
- Lasted: 27 h 57 min
- Incident open on the status page: 17:52–21:49 UTC
- The status page's incident: https://stspg.io/m0rbx38nmy1c
- Page: https://stackpulse.app/services/claude/outages/2026-11-12-1753

## What broke when (UTC)

| Component | Status | From | To |
|---|---|---|---|
| claude.ai | partial outage | 2026-11-12 17:52 | 2026-11-12 22:23 |
| claude.ai | degraded performance | 2026-11-12 22:23 | 2026-11-13 21:49 |
| Claude Cowork | partial outage | 2026-11-12 18:34 | 2026-11-12 22:23 |
| Claude Cowork | degraded performance | 2026-11-12 22:23 | 2026-11-13 21:49 |

## At the same time

- [Litmus](https://stackpulse.app/services/litmus.md): major_outage from 2026-11-12 18:05 UTC
- [U-Haul](https://stackpulse.app/services/u-haul.md): major_outage from 2026-11-12 18:08 UTC
- [Greenhouse](https://stackpulse.app/services/greenhouse.md): major_outage from 2026-11-12 18:13 UTC
- [GoDaddy](https://stackpulse.app/services/godaddy.md): major_outage from 2026-11-12 18:19 UTC
- [OpenAI](https://stackpulse.app/services/openai.md): issue from 2026-11-12 18:29 UTC
- [GitHub](https://stackpulse.app/services/github.md): issue from 2026-11-12 18:44 UTC
- [Mailgun](https://stackpulse.app/services/mailgun.md): issue from 2026-11-12 18:53 UTC
- [Daxko](https://stackpulse.app/services/daxko.md): issue from 2026-11-12 18:57 UTC

Problems at the same time are a clue, never proof that one caused another.

Stackpulse isn't affiliated with Claude.