A widespread Microsoft outage disrupted email and workplace apps Thursday, leaving users unable to open Outlook inboxes, send messages or connect to other Microsoft 365 services. Problems were also reported with Teams and Copilot, according to Reuters.

Microsoft said servers were failing automated checks and becoming unavailable, putting more pressure on the remaining infrastructure. The company has been restarting affected servers and testing changes to bring them back online. Its service notices, reproduced by the University of Pennsylvania, identify the email disruption as incident EX1550543 and the broader Microsoft 365 problems as MO1550821.

The disruption remained unresolved in the latest updates reviewed Thursday afternoon, with no confirmed time for full restoration. An earlier Teams incident was resolved, but that did not mark the end of the wider outage.