A Microsoft 365 outage disrupted Outlook, Teams calendars, ChatGPT and Claude on November 12. Read about the cause, Downdetector reports and recovery efforts. Microsoft 365 Outage Continues To Affect Teams And AI ServicesOOutlook News DeskCurated by: Saher Hiba KhanUpdated on: 13 November 2026 8:57 am Published at: 13 November 2026 8:54 amThe November 12 disruption affected Outlook inboxes, Teams calendars and Microsoft 365 connections used by ChatGPT and Claude, with service restoration.