Microsoft Outlook Outage Leaves Millions Without Email—Live Updates on Causes, Fix Timeline, and Workarounds

Microsoft Outlook users worldwide are scrambling for alternatives this afternoon after a major Outlook outage knocked email, calendar and Microsoft 365 services offline. Outage-tracking site Downdetector logged more than 83,000 problem reports for Outlook and 22,000 for Microsoft 365 within the first hour of the disruption, which began just after 12 p.m. ET on 12 November 2026. Microsoft’s official @MSFT365Status account acknowledged the incident, confirming that “users may be unable to access Exchange Online mailboxes through multiple connection methods.” The company says engineers are “rerouting traffic” while it investigates the root cause, but it has not provided an estimate for full restoration. Who is affected • Business and consumer Outlook.com accounts across North America, Europe and parts of Asia Pacific • Microsoft 365 apps that rely on Exchange Online—including Teams meeting invites, OneDrive sharing links and Copilot email summaries—are seeing intermittent errors • Third-party email clients (iOS Mail, Android, macOS Mail) that use Exchange protocols are timing out during sync Real-time symptoms 1. Web Outlook stalls on a spinning blue icon or returns a 500 server error. 2. Desktop Outlook shows “Trying to connect…” in the status bar. 3. Mobile pushes stop; swipe-to-refresh yields “Cannot connect to server.” How to confirm the Outlook outage • Check Downdetector’s Outlook heat map for spikes in your region. • Visit the Microsoft 365 Service Health Dashboard (admin.microsoft.com) or the public status page on X/Twitter. • Attempt a connection via Outlook on the Web; if it fails, the issue is unlikely to be local. Work-around options while Outlook is down • Switch to Gmail or another email address for urgent communication. • Use Microsoft Teams chat or Slack channels for internal messages—Teams itself is largely unaffected, according to early telemetry. • Forward critical mail from a connected alias (if previously configured) to a non-Microsoft mailbox. • Download recent email headers via the Outlook mobile app’s “Sync last 3 days” setting; some users report partial success. What caused the Microsoft 365 outage? Microsoft has not yet detailed the cause, but early signs point to an Exchange Online infrastructure fault that propagated across multiple data-center regions. The company’s phrasing—“rerouting traffic to alternate infrastructure”—suggests a networking or load-balancer issue rather than a security incident. When will Outlook be back up? Historically, comparable Microsoft 365 disruptions have lasted between one and four hours. In January 2026, a similar Exchange routing error was resolved in just under three hours. Administrators are advised to monitor the Microsoft 365 admin portal and @MSFT365Status for rolling updates. Why this matters Outlook remains the backbone of corporate communication; an hour-long global outage can interrupt deals, delay support tickets and stall government services. Thursday’s incident underscores the importance of diversified communication channels and a documented business-continuity plan. What to do next • Notify your staff of the outage and share alternative contact methods. • Consider enabling automatic mailbox forwarding once service is restored to cushion future disruptions. • Review your organization’s incident-response checklist and update it with lessons learned today. This story will be updated as Microsoft releases additional details or confirms a full recovery.