Microsoft’s Outlook email platform suffered a widespread outage that began late Wednesday, 9 July, and extended well into Thursday, preventing many users around the world from signing in, loading inboxes or sending messages across web, desktop and mobile versions. The company said on its Microsoft 365 status page that a configuration issue was disrupting authentication services. Outage tracker Downdetector recorded roughly 2,700 problem reports shortly before noon Eastern time on 10 July. Outlook, which serves more than 400 million users globally, experienced interruptions in multiple regions including North America, Europe and Australia. Microsoft started rolling out a fix overnight but reported that its initial remedy had failed. After further adjustments, the firm announced at about 3:30 p.m. ET that the configuration change had fully propagated and service had been restored for all users. The company has not disclosed the underlying cause and said it continues to monitor system performance. The incident adds to a series of service disruptions Microsoft has faced over the past year, underscoring the challenge of maintaining reliability for a suite used by businesses and consumers worldwide.