Microsoft 365 outage disrupts Outlook, Teams, and Copilot in Japan

A major connectivity outage is affecting Microsoft 365 services, including Outlook, Teams, and Copilot, since early November 13 Japan time, with Microsoft investigating and working on recovery. The outage, tracked as incidents EX1550543 and MO1550821, impacts seven services: Exchange Online, Teams, SharePoint Online, Copilot, Defender XDR, Planner, and To Do. Microsoft attributes the issue to failed health checks on some servers, causing load concentration on remaining infrastructure, and is rerouting traffic and applying workarounds. IT administrators are advised to monitor the Microsoft 365 admin center or public status page for updates, though the public page may show normal status while incident reports indicate degradation. The root cause is not yet confirmed, and Microsoft has paused system changes to mitigate impact.