Microsoft 365 outage knocks out the ChatGPT and Claude connectors
A Microsoft 365 failure also broke the links that let ChatGPT and Claude read Microsoft mail and calendars, which shows how much these assistants depend on outside services.
The short version
- Outlook, Teams and Microsoft 365 Copilot had trouble connecting or could not connect at all.
- OpenAI and Anthropic both reported that their Microsoft 365 connectors for ChatGPT and Claude were not working properly.
- Anthropic said the email, calendar and search tools failed for most requests, and Claude for Outlook was affected.
- Microsoft is bringing affected servers back in stages and says the restored ones are holding steady.
- Rerouting traffic gave limited recovery in some regions, with fixes for other regions still planned.
Why it matters
An AI assistant can look healthy and still stop working when a service it depends on goes down. If your team uses ChatGPT or Claude to read Microsoft mail or calendars, an outage like this can look like an AI fault when the cause is elsewhere. Knowing that saves time when something breaks.
What broke
As itmedia.co.jp reported, several Microsoft 365 services ran into trouble on the morning of the report, Japan time. Among them were Outlook, Teams and Microsoft 365 Copilot. Users found it hard or impossible to connect.
The problem spread beyond Microsoft's own apps. OpenAI and Anthropic both said the Microsoft 365 connectors for ChatGPT and Claude were not working normally.
Claude's connectors took a direct hit
A connector is the link that lets an AI assistant reach into another service, such as your inbox, and fetch information for you. When the service behind it fails, the link fails with it.
Anthropic was specific about the damage. For email, calendar and search tools, it said the connector does not work for most requests. It added that Claude for Outlook was affected as well.
Microsoft's recovery so far
Microsoft said it is restoring the affected servers a few at a time, and that the ones already back are staying stable. It is also sending traffic along alternative routes, which has brought limited recovery in some regions.
The company said it plans similar steps for other regions. The source gives no cause for the outage and no time for full recovery, so we can't say how long the disruption will last.
What to do about it
The practical lesson is a simple one. When an AI tool that reads your Microsoft data stops answering, check the status of Microsoft's services before blaming the assistant.
For deadline work, keep a manual way to reach your mail and calendar, so one failing link does not stall everything.
What to watch
- When Microsoft confirms full recovery in all regions, and whether the connectors return to normal at the same time.
- Whether Microsoft, OpenAI or Anthropic explains the cause of the outage.
Try it
Find out where your organization checks Microsoft 365 service status, and bookmark it so you can check it first the next time an AI connector stops working.
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Listen to the daily showsFirst reported by itmedia.co.jp · Read the original. Written by the SI Agent News Desk from the reporting above.Written with AI from the source above. Every number is checked against the source. Spot a mistake? Corrections.