Microsoft reveals technical fault behind global outage of Outlook and Teams

Microsoft attributed a global daylong outage affecting Outlook, Teams, and other services to a network upgrade issue, not cyberattacks or AI agents. The company confirmed the technical fault and said recovery began Friday afternoon. The problem originated from an earlier network capacity upgrade that surfaced after a recent network change, Microsoft stated. Services were restored gradually to ensure stability, with some hiccups persisting into Friday evening, and the company apologized for the disruption. The outage began late Thursday and impacted Microsoft 365 and Copilot across dozens of countries. Microsoft pledged a full post-incident report following a complete review of the event.