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Thousands of Microsoft 365 customers worldwide reported having issues with services like Outlook and Teams on Monday.

In social media posts and comments on platforms like outage tracker Downdetector, some impacted said that they were having trouble seeing their emails, loading calendars, or opening other Microsoft 365 applications such as PowerPoint.

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acknowledged “an issue impacting users attempting to access Exchange Online or functionality within Microsoft Teams calendar” earlier in the day. In updates on X, the company’s status page said it identified a “recent change” that it believed to be behind the problem — and was working to revert it.

We’ve identified a recent change which we believe has resulted in impact. We’ve started to revert the change and are investigating what additional actions are required to mitigate the issue. For more information, please refer to MO941162 in the admin center.

— Microsoft 365 Status (@MSFT365Status)

Microsoft shared that it was deploying a fix — which, as of shortly before noon ET, it  had reached about 98% of “affected environments.” Still, the company later noted that targeted restarts were taking slower than expected for the majority of affected users.

“We’re facing delays in our recovery efforts and are taking immediate action to address them,” Microsoft 365 status  Monday afternoon.

“We understand the significant impact of this event to your businesses and are working to provide relief as soon as possible.”

Data on Downdetector showed thousands of outage reports from users of , particularly . Reports appeared to peak around noon ET Monday, but have fallen some since.

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Around 12:30 p.m. Monday, Microsoft said  that it had completed additional actions and is seeing some recovery.

“We’re continuing to monitor the service while we complete other workstreams intended to fully resolve the issue,” the company wrote. “Details can be found in the admin center under MO941162.”

Contributing: The Associated Press and Julia Dallas, MyNorthwest