Microsoft 365 outage takes down Office web apps, admin center

Microsoft experienced a widespread Microsoft 365 outage affecting Office web apps, Outlook, OneDrive and the Microsoft 365 admin center due to a token generation/authentication expiry issue; Microsoft tested a fix (reverted to an alternate token flow and disabled proactive caching), deployed remediation, and subsequently reported the incident resolved. The article also notes historical outages, including a prior incident linked to a DDoS amplification error, but the current event is described as a service change/availability issue rather than confirmed malicious compromise.