Microsoft Outlook and cloud tools suffer massive global disruption

UPDATE - follow-up to Microsoft 365 outage drags on as company observes 'limited recovery': A major worldwide outage hit Microsoft Outlook, Teams, and Copilot, knocking out services across 74 countries and territories. Downdetector reported that the disruption spread globally within one hour, affecting users in the Americas, Europe, Asia, and Africa. Microsoft blamed the failure on an elevated load across its infrastructure in multiple regions. The company stated it paused all deployments, moved traffic away from the trouble spots, and restarted affected servers. In the United States alone, about 130,000 users faced problems with Outlook at 1 pm Eastern Time, though reports later dropped to 37,000 users by 6 pm. Microsoft shared ongoing updates on X while working to reduce the impact.

Context

Cloud-based services like Microsoft 365 rely heavily on massive shared data centers that serve millions of users at the same time. When a major server load issue happens, it can quickly knock out multiple connected work and communication apps across the globe. As systems slowly bring back capacity, users usually see a gradual return to normal service.