Microsoft Confirms Exchange Outage Affected Users Worldwide Has Now Been Fixed

There is also a quick fix for users who are still experiencing issues


Image: Shutterstock via Dennis

Microsoft has confirmed that an Outlook and Exchange Online outage that affected dozens of users worldwide has now been resolved.

The company said some of its network infrastructure was “performing below acceptable thresholds” and was redirecting the affected connections to better-performing infrastructure to resolve the issue.

it later clarified that the root cause was a faulty network router and said the most affected users were in the northeastern US, although users reported problems online outside of North America, in regions such as Brazil and as far as Europe in Portugal.


IT administrators are advised to check EX401976 and OL401977 in their admin center for more information about the incident if necessary.

According to user reports, issues with key business services persisted for hours and they saw that they could not connect Outlook to Microsoft Exchange Online – Microsoft’s mail server – and experienced reduced performance in the Outlook mobile app and Outlook on the web.

Some users continued to report issues after Microsoft announced the issues had been resolved, following an internal investigation that lasted about two hours.

User complaints seemed to stop in the hours after Microsoft’s fix and some said that restarting Outlook resolved the remaining issues.

Failures affecting commonly used technology services are relatively common and comparable to Microsoft; lastly, they are usually repaired quickly and are not caused by a significant malfunction.

Microsoft suffered a separate malfunction last month where users struggled to connect to Exchange Online and multiple other Microsoft 365 services, such as the Teams collaboration app.

It’s rare for a company’s services, which many business users rely on, to experience outages that have lasting effects. However, collaboration software giant Atlassian announced a cloud outage that it said would take more than two weeks to fix.

The owner of popular tools like Trello said a failure in its Jira and Confluence products didn’t affect all customers, but admitted the outage was “unacceptable.” The timing was also unfortunate, as customers started reporting issues when it hosted its flagship Team ’22 conference, where it usually announces new products.

© Dennis Publishing

Read more: Microsoft Microsoft Exchange Security

Get in Touch

Related Articles

Get in Touch


Latest Posts