Microsoft 365 suffered a global service disruption in the early hours of today (Nov. 13), Hong Kong time, affecting Exchange Online (Outlook), Teams, SharePoint Online and Copilot. Services began recovering after Microsoft restarted servers, but Friday working hours may still bring email delays, login problems or unstable online meetings for Hong Kong businesses and employees.
The outage began around 2 am. Downdetector recorded more than 130,000 Outlook outage reports at its peak. Microsoft confirmed a global outage; AWS and Google briefly showed sporadic false reports, and Amazon said its systems were normal.
Microsoft said the cause was not a traffic surge but a large number of servers unexpectedly going offline and failing automated health checks, overloading remaining infrastructure. It found no evidence of a cyberattack, paused all deployments and configuration changes, and is reviewing recent updates. By around 5 am, Microsoft had verified an alternative health-check solution and begun restarting affected servers; by 5:45 am, reports had fallen to about 50,000-plus, though services were not yet fully normal.
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