Microsoft 365 massive outage exceeds 6 hours, Outlook, Teams and other services still not restored

Microsoft 365 suffered a global outage lasting more than six hours after service disruptions began around 01:54 Beijing time on November 13, initially affecting Exchange Online email access for users in the Americas before Microsoft confirmed that users in any region could be impacted. The affected services include Outlook.com, OneDrive, OneNote, To Do, Teams and web-based Microsoft 365, with the status page listing the incident as "service degradation." Microsoft said the cause was not a traffic surge but a large number of servers unexpectedly becoming unresponsive, overloading the remaining infrastructure after a core process on the affected servers became overloaded and caused capacity loss. The company has paused all deployments, rebooted affected servers and shifted traffic to other routes, while warning that recovered servers may become unresponsive again once they resume receiving traffic. Microsoft is analyzing diagnostic data to find the root cause, restricting certain traffic types to affected infrastructure in some regions and rebuilding some servers with an older configuration to validate the fix, with the next update expected before 12:30 Beijing time.