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On February 4, 2021, at ~4:30 pm UTC, Microsoft reported an issue that was causing some users in North America to experience issues when attempting to join meetings in Microsoft Teams.
Many users took to Twitter to express their frustration due to little information available in the Service Health Dashboard and the multiple issues that had taken place in the past week.
On February 3, 2021 at ~10:45 pm UTC, Microsoft reported an issue that was causing some users in North America to experience issues with Exchange Online.
Many users quickly confirmed they that they weren't experiencing delays but rather emails altogether bouncing as well as error messages claiming service was unavailable.
On February 1, 2021, at ~6:00 pm UTC, Microsoft reported an issue that was causing some users to experience delays when attempting to access Microsoft 365 services.
Many users confirmed they were experiencing this issue throughout the U.S. with what appeared to be a heavy impact in the California region.
On January 27, 2021, at ~9:30 pm UTC, Microsoft gave a first report of an issue that was preventing users from accessing email in the North American region via Exchange Online.
Shortly after, Microsoft reported that they had identified that a recently deployed configuration change to a specific portion of their infrastructure may be the cause of this issue for some users.
On January 18, 2021, at ~10:30 am UTC, Microsoft reported an issue that was affecting chat functionality within Microsoft Teams in the EMEA region.
Shortly after, Microsoft reported that they had redirected traffic and that monitoring was showing signs of recovery.
On January 15, 2021 at ~1:00 am UTC, Microsoft reported an issue affecting multiple Microsoft 365 services .
Shortly after, Microsoft reported that they were actively investigating an issue that may be resulting in service functionality degradation for multiple Microsoft 365 services.
On January 12, 2021 at ~4:45 pm UTC, Microsoft reported an issue with SharePoint and OneDrive for Business and Microsoft Teams.
Shortly after, Microsoft confirmed that these issues were part of the same problem and that services were recovering. They were still attempting to discover the root cause of the problem and informed users that more information could be found in the admin center.
On January 5, 2021, at ~3:00 pm UTC, Microsoft reported an issue affecting users in the UK that may be preventing them from accessing the Microsoft 365 admin center.
Roughly 2 hours later, they confirmed that a portion of their processing infrastructure wasn't handling requests as expected and that they were repairing the problem to restore service access for affected users.
On December 14, 2020 at ~7:45 am UTC, Microsoft reported an issue affecting users throughout Europe that may be preventing them from accessing Microsoft 365 services.
Shortly after, Microsoft reported that they had identified an issue with components which facilitate authentication requests. They also reported that they had performed optimizations and rerouted user requests in an effort to remediate impact.
On December 11, 2020, at ~2:00 pm UTC, Microsoft reported an issue affecting users in the United Kingdom (UK) that may be preventing those users from accessing Microsoft 365 services.
Shortly after, Microsoft also reported that they had been receiving reports that some users outside of the UK may also be experiencing the issue.