# Microsoft Says Cyberattack Did Not Cause Global Microsoft 365 Outage

By Simon Yoon

Canonical URL: https://www.tokenpost.com/news/technology/56349
Published: 2026-11-13T05:28:54.000Z
Updated: 2026-11-13T05:28:54.000Z
Section: Technology

> The company said some servers stopped working, leaving the remaining servers overloaded across affected services.

Microsoft said a global outage affecting Outlook, Teams, Copilot and other Microsoft 365 services was not caused by a cyberattack or a surge in users. The company attributed the disruption to server failures that overloaded systems still running.

Some servers supporting the services stopped working, Microsoft said. The servers that remained in operation then became overloaded, leaving the affected products disrupted. The company described a sequence in which failed servers were followed by excess load on the others.

Microsoft’s explanation identifies infrastructure failures as the cause and rules out both malicious activity and unusually high demand. That distinguishes the company’s stated explanation from an attack or a user-driven traffic spike.

The outage was global and affected multiple Microsoft 365 services, not just Outlook. Teams, Copilot and other services were also included in the disruption. Microsoft’s account places the failure in the server systems supporting those products, with the remaining servers unable to handle the load after some stopped working.