Security News > 2022 > June > Microsoft reveals cause behind this week’s Microsoft 365 outage
Microsoft has revealed that this week's Microsoft 365 worldwide outage was caused by an infrastructure power outage that led to traffic management servicing failovers in multiple regions.
Starting on Monday, June 20, at 11:00 PM UTC, customers began experiencing and reporting several issues while trying to access and use Microsoft 365 services.
According to Microsoft, problems encountered during the incident included delays and failures when accessing some Microsoft 365 services.
The affected services included the Microsoft Teams communication platform, the Exchange Online hosted email platform, SharePoint Online, Universal Print, and the Graph API. Microsoft's response while investigating the root cause behind the outage also brought to light some issues related to how the company fails to share new incident-related info with customers.
More than 16 hours after the first signs of the outage were detected, on Tuesday, June 21, at 3:27 PM UTC, Microsoft said in an update to the MO394389 service alert sent to customers that the root cause was an infrastructure power loss.
"An infrastructure power outage necessitated failing over Microsoft 365 traffic management servicing users primarily in Western Europe," the company explained.
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