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Microsoft Outlook Outage Leaves Thousands Without Email as Servers Fail Health Checks

Microsoft Outlook went down for thousands of users on Thursday, 12 November 2026, after a large number of the company’s servers failed automated health checks. The failure disrupted Outlook email, Microsoft Teams, SharePoint, OneDrive and the Microsoft 365 Copilot assistant, leaving businesses, schools and government offices without core workplace tools for hours. Microsoft acknowledged the problem during the afternoon in…