Microsoft says Microsoft 365 is fully back after outage

Microsoft says Microsoft 365 is back to normal. Its official status account posted at 12:09 a.m. Saturday (Mexico City time) that engineers had finished fixing the underlying problem and restored service to the customers and regions still affected. Further updates are filed under incident MO1550821 in the Microsoft 365 admin center.

The outage, which locked users out of Exchange Online mailboxes and, by extension, Outlook and Teams, began Thursday, Nov. 12, as incident EX1550543. It lasted more than a day.

Recovery on Friday was gradual. By midday Microsoft was still draining queued messages and rebalancing traffic and had no estimate for full recovery. That night it said it would keep watching the service for an extended period because of how severe the impact was.

Getting back into Outlook does not mean the backlog of mail has arrived. Microsoft itself warned Friday that access can return before pending messages do, so anything sent Thursday or Friday, especially messages that asked for a reply, is worth checking.

Microsoft has not published a cause or its post-incident report, and it has issued no country-level notice, so it is unclear whether users in Mexico were hit in particular. IT teams can request the report through incident MO1550821.