Microsoft struggling to fix massive cloud outage that's taken down email and Intune

The incident started at around 18:00 UTC on November 12, and meant services including Exchange Online, Teams, Copilot 365, and Defender for Office 365 became unavailable. Admins trying to figure out what was wrong couldn’t access tools like Intune or the Microsoft 365 Apps Admin Center – they went down, too. On its X feed, Microsoft blamed “a problem that's causing servers to fail automated health checks and become unavailable.” The company said it hasn’t spotted any changes to its systems that might have sparked the incident, but its early investigation “indicates the failed health checks may originate from a specific component that's responsible for processing server health.”