Millions of professionals and casual users found themselves locked out of their digital offices on Thursday as a massive technical failure crippled several of Microsoft’s most critical services. The disruption primarily targeted Outlook, where nearly 130,000 people flooded the tracking site Downdetector reporting that they could neither send nor receive emails. For many, inboxes simply refused to load, bringing business communications to a grinding halt across the Americas.
The chaos extended far beyond email, as thousands more reported significant glitches within Microsoft Teams and the company’s AI assistant, Copilot. This wide scale collapse affected various parts of the broader Microsoft 365 suite, leaving corporate teams unable to coordinate via chat or access essential cloud documents throughout the afternoon.
In a series of updates shared on social media, the Redmond-based tech giant explained that a portion of its infrastructure suffered from an unexpected surge in load. According to Microsoft, a specific flaw triggered during automated health checks caused a number of servers to become unexpectedly unavailable, effectively knocking them offline and creating a bottleneck for users trying to connect to Exchange Online mailboxes.
While Microsoft stated that it has successfully restored much of the functionality for Teams in North America, engineers continue to work on fully stabilizing Outlook. The company noted it is currently testing fixes and deploying alternative health check methods to revive impacted servers, promising that they are aggressively pursuing every possible pathway to resolve the remaining connectivity errors.