Microsoft 365 Outage Causes Outlook, Exchange Online and Teams to Be Unavailable

Microsoft has begun investigating a continuing outage that is affecting multiple Microsoft 365 services, after customers reported connection problems.

“We’re investigating issues impacting multiple Microsoft 365 services. “We have identified a possible networking problem and will be reviewing telemetry in order to identify the next steps,” said the Microsoft 365 team via a Twitter thread.

We have identified the issue as a networking problem and are analyzing how to mitigate them without creating additional damage.

Redmond claims that users in all areas currently served by the impacted infrastructure might not be able to access affected Microsoft 365 services.

This outage will affect Microsoft Teams, Exchange Online and Outlook as well as OneDrive for Business and OneDrive for Business.

We’re investigating issues impacting multiple Microsoft 365 services. You can find more information in the MO502273 admin area.

— Microsoft 365 Status @MSFT365Status

Additional information regarding this incident was shared by the Azure team on the Microsoft Azure status page.

Customers may have issues connecting to Azure resources, including PowerBI, starting at 07:05 UTC, 25 January 2023.

We have determined that the problem is affecting network connectivity between devices on the Microsoft Wide Area Network. It affects connectivity between clients using the internet to Azure as well connectivity between datacenters and ExpressRoute services.

The issue has been affecting people in waves. It peaks approximately once every thirty minutes. “We are currently investigating the issue and will keep you updated as soon as we learn more.”

Some customers are also having trouble loading Microsoft Azure status pages. This causes intermittent “504 Gateway Timeout” errors.

Update January 25, 04:39 EST:

The Azure team says the root cause behind this outage was a recent Microsoft Wide Area Network (WAN) update. The update has now been rolled back.

Microsoft states that it has identified a recent WAN upgrade as the probable cause and is taking steps to reverse this change.

Our latest Telemetry data shows that there are signs of recovery in multiple areas and across services. We continue to monitor the situation closely.”

It’s a story in development…