Microsoft 365, Outlook down for thousands of US users, Downdetector shows

What happened

Microsoft 365, Outlook and Teams were down for thousands of US users on Thursday, according to Downdetector reports. Microsoft paused deployments, moved traffic away from affected infrastructure and restarted servers. The disruption also affected connectors used by OpenAI and Anthropic AI services.

Confirmed

Global impact / market context

When Microsoft services or connectors fail, businesses can lose access to email, collaboration tools and connected AI features. That can delay work and reduce output; firms may need to switch to alternatives, adding operating costs while Microsoft works to restore service.

Analyst inference

Downdetector recorded more than 97,000 Outlook issue reports, more than 38,000 for Microsoft 365 and about 4,500 for Teams, but these are reports rather than confirmed user counts. The article reports no financial losses, share-price movement or lasting damage.

Confirmed

What to watch

1. Microsoft said it was moving traffic and restarting servers; a further update could show whether these steps restored access and whether the disruption continues across regions. Analyst inference
2. OpenAI was investigating broken new Microsoft connector connections and tools not working as expected. Recovery could restore AI features that depend on those connections for users. Analyst inference
3. Anthropic identified an upstream-provider issue affecting its Microsoft 365 connection. Clarification on whether its service depends on Microsoft's repairs could show the outage's reach. Confirmed

Evidence

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