The major Microsoft 365 outage has made Outlook, Teams and other services unavailable, with the impact spreading worldwide. The cause was failed health checks on multiple servers, and the timing of full recovery remains undecided.
Microsoft said on the 12th that a major outage was occurring in its business cloud service Microsoft 365. The affected services included Outlook, Teams, Copilot and SharePoint. Reports emerged on the morning of the 12th U.S. Pacific Time, and as of 11 a.m. on the 13th Japan time, no timetable for full recovery had been indicated.
Microsoft said the cause was that multiple servers had unexpectedly become unavailable, concentrating the load on the remaining systems, and that it was working to restore the servers. Failed health checks were cited as the basis, but the detailed cause has not been disclosed.