Tens of thousands of users experienced widespread disruptions to Microsoft Outlook and Microsoft 365 services on Thursday afternoon.

Reports on DownDetector began surging shortly after 12:30 p.m. ET, with user complaints reaching nearly 130,000 within an hour. Microsoft confirmed the service disruption on its official Microsoft 365 Status social media account, noting that the issue affected Exchange Online mailboxes across multiple connection methods in the Americas and potentially other regions.

While the company did not disclose the root cause of the outage, Microsoft stated that automated recovery features and mitigation efforts were deployed to restore connectivity and reduce the impact on users.