Microsoft races to fix Exchange Online outage as thousands report problems
Microsoft 365 says it's working to fix an Exchange Online problem that's blocking users from reaching their mailboxes, and warns the trouble could hit any region. More than 39,000 people have already flagged issues to Downdetector.
- 9 sources report it: breakingthenews.net, variety.com, X account @Cointelegraph, theverge.com and 5 more.
- The source published it on Nov 12, 2026 at 6:15 PM.
Nothing open. Every check passed.
Microsoft 365 confirmed Thursday it's aware of a problem hitting Exchange Online mailboxes and says fix work is underway. The trouble centers on reaching Exchange Online mailboxes through several connection methods, with the Americas bearing the brunt — though the company warns it could surface elsewhere. Microsoft put it plainly: the issue may affect Microsoft 365 service connectivity for users in any region.
Users aren't waiting for an official confirmation. Downdetector has logged more than 39,000 reports of problems with the service. That's a big blast radius for mailboxes that many workplaces treat as their front door.
The outage lands on a rough stretch for Microsoft. On Nov. 10, its shares fell 3% in a sudden move after Anthropic announced new workplace tools for Claude — Claude Sheets, Claude Whiteboards and Claude Data — pushing the AI assistant deeper into Microsoft Office territory. At 12:45 pm ET, Microsoft traded 3.33% lower at around $527.12.
Microsoft 365 hasn't said what caused the Exchange Online issue or when it expects service back to normal, only that mitigation is in progress.
TopicsMicrosoft · Microsoft 365 · Exchange Online · Outlook · Downdetector · Anthropic · Claude
Written by Paparazzi with AI. Not financial advice.