Microsoft experienced a major outage on March 19, 2025, affecting Outlook on the web. The issue was caused by a code error in a recent update, preventing many users from accessing their accounts and communication tools.
The outage began in the afternoon, with users reporting trouble logging in, accessing the site, and facing server issues.
DownDetector showed thousands of users facing disruptions shortly after the outage started.
Microsoft’s 365 Status team acknowledged the issue on X (formerly Twitter), saying, “We’re investigating reports of an issue affecting users’ ability to access Outlook on the web.”
The company directed users to the admin center with incident reference number EX1036356 for more details.
Microsoft identified the cause of the disruption as a faulty code. They worked to revert the recent code change and reviewed data to plan next steps.
The company rolled back the update, a method that has worked in similar cases before.
“We found a recent change to Outlook’s web infrastructure that caused the issue. We’re reverting it and monitoring closely,” Microsoft stated.
This incident adds to a series of recent outages affecting Microsoft’s cloud services. In early March, a similar code change caused disruptions in Outlook and other Microsoft 365 services. After several hours of work, Microsoft reverted the change and confirmed the issue was resolved for all users.
“We’ve reverted the change and confirmed the issue is resolved for all users. For details, refer to EX1036356 in the admin center,” Microsoft stated in their final update.
As the investigation continues, users and IT admins are urged to stay informed and report any ongoing issues through official channels.
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