Microsoft 365 outage takes down Teams, Exchange Online, Outlook

Microsoft 365

Microsoft is investigating an ongoing outage affecting multiple Microsoft 365 services after customers reported experiencing connectivity issues.

“We are investigating issues affecting multiple Microsoft 365 services. We have identified a potential network issue and are reviewing telemetry to determine next troubleshooting steps,” the Microsoft 365 team said in a Twitter thread.

“We have isolated the problem to network configuration issues and we are analyzing the best mitigation strategy to resolve these without causing further impact.

According to Redmond, users across all regions currently served by the affected infrastructure may not be able to access the affected Microsoft 365 services.

The list of services affected by this outage includes Microsoft Teams, Exchange Online, Outlook, SharePoint Online, OneDrive for Business, PowerBi, Microsoft 365 Admin Center, Microsoft Graph, Microsoft Intune, Microsoft Defender for Cloud Apps and Microsoft Defender for Identity, as disclosed in a service health notice.

The Azure team shared additional information related to this incident on the Microsoft Azure service status page.

“Beginning at 07:05 UTC on January 25, 2023, customers may experience network connectivity issues manifesting as network latency and/or timeouts when attempting to connect to Azure resources in public Azure regions as well as other Microsoft services , including M365, PowerBI,” the update reads.

“We have determined that the network connectivity issue occurs with devices across the Microsoft Wide Area Network (WAN). This affects connectivity between clients on the Internet to Azure, as well as connectivity between services in data centers, as well as ExpressRoute connections.

“The issue is causing impact in waves, peaking approximately every 30 minutes. We are actively investigating and will share updates as soon as more is known.”

Currently, some customers are also having issues loading the Microsoft Azure status page, which intermittently shows “504 Gateway Timeout” errors.

Azure status page error
Azure Status Page Error (BleepingComputer)

Update 25 January at 4:39 AM EST: The Azure team says the root cause of this outage was a recent Microsoft Wide Area Network (WAN) update. The update has now been rolled back.

“We have identified a recent WAN update as the likely underlying cause and have taken steps to roll back this update,” Microsoft says.

“Our latest telemetry shows signs of improvement across multiple regions and services and we continue to actively monitor the situation.”


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