Microsoft fixes connection issue affecting Outlook email apps

Microsoft implemented service changes on January 31 and February 2, 2024, to fix Outlook.com connection issues causing repeated authentication prompts across Outlook 2013/2016, Outlook for Microsoft 365, Thunderbird, and mobile apps, with guidance to use app passwords for legacy clients; while lingering reports persisted early on February 5, Microsoft later confirmed full resolution. The report also notes prior Outlook-related problems, including crashes, 401 errors impacting search, and earlier DDoS disruptions claimed by Anonymous Sudan.