By Simon Sharwood
Publication Date: 2026-11-12 23:06:00
Microsoft is struggling to restore many of its cloud services after a core process running on some servers became “overwhelmed” and its attempts to fix the problem failed.
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…
