01/22/2026
Major Microsoft Outage
More info: Users may be receiving a "451 4.3.2 temporary server issue" error message when attempting to send or receive email through Outlook.
Some of the impacted service functions include, but may not be limited to:
- Sending and receiving email through Exchange Online, including notification emails from Microsoft Viva Engage.
- Accessing the service portals, including Microsoft Purview, Microsoft Defender XDR, and the Microsoft 365 admin center.
Current status: We've identified a portion of dependent service infrastructure in the North America region that is not processing traffic as expected. This is impacting our load balancing processes and general service availability. We're working to restore this infrastructure to a heathy state and rebalance the service traffic to achieve recovery.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted.
