Microsoft 365 outage update: When will Outlook, Teams and other services be back up? Company probes Exchange issues

Microsoft is investigating a service disruption that is causing authentication issues and delays or failures in email delivery for Exchange Online users. The company first recognized the problem at 5:30 PM UTC after receiving reports of a surge in user complaints on social media. Tens of thousands of Exchange Online users are reportedly affected, with issues primarily impacting the ability to receive emails through Outlook and access the Exchange Online platform.

The outage is also affecting Microsoft Azure, Microsoft Teams, and the Microsoft Store, though Microsoft has not yet confirmed the exact connection between these disruptions.

Microsoft identified a problem with an authentication component contributing to the impact. The company is applying a remediation strategy to address the issue, and once confirmed, will roll out the solution more broadly. Users have reported various symptoms, including delays or failures in sending or receiving email messages, authentication errors when accessing Exchange Online services, and intermittent failures affecting mailbox operations and message delivery processes.

Microsoft has not disclosed which regions are impacted but has categorized this outage as an incident, a term used for critical service issues that significantly affect users. The company is analyzing service telemetry to determine the underlying source of the problem and is monitoring the scope of impact and any additional affected scenarios. This marks the latest in a series of Exchange Online outages for Microsoft, with previous incidents occurring in June and April.