Microsoft Cloud Outage Hits Outlook and Microsoft 365 Worldwide

A multi-hour outage disrupted Microsoft cloud services, including the email service Outlook, affecting businesses and consumers worldwide. The duration of the disruption remained unclear. Microsoft reported problems with Exchange mailboxes in the US before stating the outage could impact users of Microsoft 365 globally. The company attempted to reroute traffic around problematic servers, while features like Teams calendar integration and the Copilot AI assistant were affected. Microsoft engineers identified a process crippling servers and brought some back online, but they encountered setbacks as servers re-hung under traffic. The company acknowledged measures did not work as expected. This followed a similar large-scale Outlook outage in late August.