Resolved: Microsoft 365 Email Delays

Last update: Aug 12, 2025, 6:22 PM CDT

Microsoft has confirmed a regional issue in Exchange Online today that caused some inbound and outbound emails to be delayed by over an hour. The incident affected a subset of users in North America from 8:00 AM to 5:15 PM CDT and is now resolved. All queued messages have been delivered.

Impact

• Affected a subset of users in the North America region.
• Some inbound and outbound messages were delayed by over an hour.
• Messages were queued before eventual delivery.

Preliminary Root Cause

Some requests that facilitate message sending and delivery were timing out due to a change in Microsoft’s Enterprise Configuration Service. This caused messages to queue and resulted in delays. Microsoft has rolled back the change.

Next Steps

• Microsoft will provide a preliminary Post-Incident Report within two business days and a final report within five business days.
• We temporarily disabled the automatic email signature system to keep mail flowing without delays. This will be re-enabled once stability is confirmed with our provider.
• No action is required from users. If you cannot find an expected email, check all folders, including Junk and Other.

If you continue to see problems, please contact IT.