Microsoft began investigating user reports of email access problems at 12:54 p.m. ET on Thursday. By 10:10 p.m. ET, many services remained down, and the company’s health status website listed “service degradation.”

A spokesperson said Microsoft was addressing issues with Microsoft 365 and working to “restore services as soon as possible.” In its latest update on X, the company said it was monitoring affected infrastructure to verify stability, which it expects to support improved availability. Downdetector, an outage-tracking service, recorded reports from thousands of users experiencing problems with Microsoft’s email and online-meetings platforms.