A widespread outage overnight hit Microsoft platforms, including Outlook, leaving many users unable to use their email accounts and encountering errors across the tech giant's suite of apps. The disruption also reached Microsoft 365 and Teams, according to outage-tracking website Downdetector.com.

Downdetector recorded more than 97,000 incidents of people reporting problems with Outlook, more than 38,000 user reports of issues with Microsoft 365 and about 4,500 reports of users having trouble accessing Teams. The site collates status reports from a number of sources, so the actual number of affected users may vary. The outage was reported to have hit thousands of US users.S2

Microsoft said earlier in the day it had fixed a Teams disruption affecting users in North America and that the impact had been fully resolved. The company later said the issue may also affect Microsoft 365 service connectivity for users in other regions. In a statement, Microsoft said it was "aggressively pursuing all pathways to reduce impact". The company said its team had paused all deployments, was moving additional traffic off the affected infrastructure and was restarting affected servers to return them to service.S2

The disruption also spread to third-party AI services. OpenAI said it was investigating an issue with Microsoft connectors in which new connections may be broken and tools were not working as expected. Anthropic said it had identified an issue with an upstream provider affecting its Microsoft 365 connector.S2