Microsoft Outlook outage locks users out as authentication glitch hits hundreds worldwide

Passwords seem fine, but logins still collapse

A major Microsoft Outlook outage hit on April 27, 2026, with more than 800 user reports piling up within hours. Microsoft confirmed service degradation and pointed to an authentication-system failure. While passwords worked for many, email access still broke for over 60% of affected users, suggesting an infrastructure issue rather than a simple app malfunction.