Microsoft 365 outage knocks out Outlook, Teams and Copilot, breaking OpenAI and Anthropic connectors

A widespread Microsoft 365 outage on Thursday disrupted Outlook, Teams, SharePoint, OneDrive and the Copilot AI assistant, with Downdetector logging more than 97,000 Outlook problem reports at 2:07 p.m. ET. Microsoft said a large number of servers had become unexpectedly unavailable, straining the rest of its infrastructure; it paused deployments, rerouted traffic and began restarting affected servers. The disruption also hit Microsoft 365 connectors used by OpenAI and Anthropic, with both companies reporting broken connections and failing mail, calendar and Teams tools.