Microsoft gives initial explanation for outage; says ‘servers were unexpectedly unavailable’

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Microsoft says unexpected server failures caused widespread disruption across its services.

Microsoft has shared an initial explanation for the widespread outage that disrupted Outlook, Microsoft 365, Teams, Copilot and several other services across multiple regions on Thursday, November 12.

The company said the problem was not caused by a sudden increase in user traffic. Instead, several servers had unexpectedly become unavailable, putting extra pressure on the remaining infrastructure and leading to connection problems.

The outage affected users in several countries, with reports spreading to 74 countries and territories within about an hour, according to Downdetector.

Outlook saw the biggest spike, with nearly 130,000 reports at its peak in the US. Microsoft 365 recorded more than 47,000 reports, while Teams and Copilot also faced disruptions. OneDrive and SharePoint were among the other affected services.

Microsoft initially said it was investigating reports of users having trouble accessing Exchange Online mailboxes through different connection methods in the Americas. It later confirmed that the problem could affect Microsoft 365 users in any region.

Also Read: Microsoft outage: Users report issues with Outlook, Microsoft 365, Store and other apps

In an update on its official Microsoft 365 Status account on X, the company said:

"While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region, more information will be provided in the Microsoft 365 admin center under EX1550543."

Microsoft later explained that several servers had unexpectedly become unavailable, putting additional pressure on the rest of its infrastructure. It said:

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