Microsoft is investigating intermittent Exchange Online mailbox access issues that have affected Outlook mobile and the new Outlook for Mac for weeks. The problem was linked to a newly introduced virtual account, Microsoft has restarted the Notification Broker service as a mitigation, and the incident was reclassified from EX1256020 to EX1268771 as the root cause remains under investigation. #ExchangeOnline #OutlookMobile #OutlookForMac #NotificationBroker #EX1256020 #EX1268771
Keypoints
- Microsoft is investigating intermittent mailbox access problems impacting Exchange Online users.
- The incident was first tracked as EX1256020 and later re-added under EX1268771 after reports of ongoing impact.
- Microsoft linked the issue to a newly introduced virtual account and is restarting the Notification Broker service as a mitigation.
- The outage has intermittently affected Outlook mobile apps and the new Outlook for Mac for several weeks, with affected regions and user counts unspecified.
- Microsoft continues analysis and is implementing additional measures to prevent the issue from recurring.