By Rabia Noureen
Publication Date: 2026-10-13 16:48:00
Key Takeaways:
- A configuration change caused an Exchange Admin Center outage, preventing administrators from accessing the management console.
- Microsoft restored service by rolling back the problematic change.
- The incident has renewed attention on change-management and validation processes for cloud services.
Microsoft experienced an outage affecting the Exchange Admin Center (EAC) on October 12 after a configuration change caused administrators to receive “Internal Server Error” messages when attempting to access the web-based management console. This issue prevented admins from managing Exchange Online resources such as mailboxes and groups, with no workaround available during the disruption.
According to Microsoft, the outage began when a recent configuration change introduced unexpected HTTP responses and 302 redirect errors within the EAC request path. Administrators couldn’t sign in to the…