Claude outage on November 12, 2026: Elevated errors affecting the Microsoft 365 connector
Claude has reported an incident affecting Claude since 17:52 UTC on 12 November 2026 (3 hours 13 minutes so far).
Open
Official incident reported by Claude
- Started
- 17:52
- 12 Nov 2026 UTC
- Status
- Open
- not resolved yet
- Duration
- 3h 13m
- 3 hours 13 minutes so far
- Impact
- Major
- as rated by Claude
- Updates
- 3
- posted by Claude
Timeline
All times UTC.
Official incident from Claude
Elevated errors affecting the Microsoft 365 connector
-
Official
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.
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Official
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.
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Official
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.
"Official" rows are quoted from Claude's public status page, status.claude.com. Very long posts are shortened.
What our checkpoints saw
HostTracker's checkpoints, which test claude.ai from several locations, recorded no outage of 5 minutes or longer during this incident. A provider can report a problem that affects only some features, regions or accounts, which a check of the main address does not see. The live Claude status shows what our checks see right now.
Does your product depend on Claude?
An outage like this one reaches your users through your product, and most teams hear about it from a customer rather than from a dashboard. HostTracker watches any endpoint you name - your own site, an API you call, a vendor you resell - from 300+ locations, confirms a failure from several of them before it says anything, and then tells you by email, SMS, voice call or your chat tool.
You get the same record you are reading here for your own services: every outage timestamped, with the checks that observed it.
Independent measurement by HostTracker. Not affiliated with Claude. Official updates are quoted from Claude's public status page and remain Claude's own words.