Microsoft Restores Microsoft 365 After Global Outage

Overview

• A global interruption that began Thursday, November 12 knocked Outlook, Teams, Copilot and other Microsoft 365 services offline for many users and lasted into Friday as engineers worked to restore service.
• Microsoft said the root cause was a failure tied to a prior capacity update that manifested after a subsequent infrastructure change and that engineers suspended updates, redirected traffic and restarted affected servers to mitigate the problem.
• By Friday the company reported progressive, regional recoveries and said it had identified and corrected the principal issue while warning some users may still see intermittent access problems.
• The outage disrupted governments, health services, airlines, financial firms and corporations worldwide, forcing workarounds such as phone, fax and manual processes and causing delayed corporate filings and service interruptions for millions of users.
• The incident highlights risks from heavy dependence on a single cloud provider and Microsoft has promised a detailed post‑incident report explaining root causes and the planned technical and operational fixes.