Some users in the United States may be intermittently unable to access some Microsoft 365 services
ID: MO1255228
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Some users in the United States may be intermittently unable to access some Microsoft 365 services
User impact: Users in the United States may have been intermittently unable to access some Microsoft 365 services.
More info: The following services may have been impacted:
- Exchange Online
- Microsoft Teams
Final status: We've confirmed that the service remains healthy after manually reinstating the entire network infrastructure that was slated for active service load and impact is remediated.
Scope of impact: Some users in the United States may have been intermittently unable to access some Microsoft 365 services.
Start time: Wednesday, March 18, 2026, at 2:00 PM UTC
End time: Wednesday, March 18, 2026, at 3:08 PM UTC
Root cause: A portion of networking infrastructure, slated for reinstatement to active service, had been only partially reinstated, which led to load balancing issues when handling service traffic.
Next steps:
- We're continuing our investigation into the partial reinstatement to better understand why this has occurred so we can determine how we can best avoid similar issues in the future.
This is the final update for the event.
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