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Microsoft restores Exchange Online email service after global outage disrupted millions
Microsoft Outlook outage disrupts email access worldwide as cloud fault blocks logins
Microsoft confirmed a widespread outage affecting its Outlook email services on Monday, disrupting access for millions of users worldwide. The issue impacted both Microsoft 365 business customers and private Outlook users, preventing logins, email sending and receiving, and mailbox synchronization, according to the company’s official status updates .
The outage originated in Microsoft’s Exchange Online cloud infrastructure, where a fault in a central authentication and connection component blocked access to mail servers, the company stated. The incident was internally tracked under the identifier EX1464935 .
Reports of disruptions surged on outage-tracking platforms, with Downdetector recording tens of thousands of complaints within hours. By 2 p.m. ET on Monday, over 5,000 users had reported issues, while social media users described delays, authentication errors, and mailbox freezes .
Microsoft engineers initiated countermeasures overnight, deploying targeted corrections to affected servers. The company later reported that telemetry data showed a significant recovery, with traffic gradually returning to normal systems. However, some users were advised to expect lingering delays as backlogs in email delivery and global synchronization were cleared .
IT experts warned users against altering local settings or reinstalling software, as the problem was server-side. They also cautioned against manually resending emails stuck in outboxes to avoid duplicate deliveries .
Microsoft did not specify when full service would be restored globally. The company first acknowledged the issue around 11:30 a.m. ET on Monday and later confirmed it was testing a solution before broader deployment .
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