Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to search in Exchange Online – RESOLVED

09/09/2026 08:49:00 AM

NHS.net Connect Reference: INC46930077

Microsoft Reference: EX1469261

Issue Status: RESOLVED

Issue Description: Users may be unable to search in Exchange Online.

More info: Users may be unable to complete searches using Outlook on the web or either the classic or new Outlook desktop apps.

Final Update: 10/09/2026 10:01:00 AM – Microsoft has confirmed after further analysis of search traffic patterns during the impact window that the problem was the result of a portion of Exchange Online infrastructure responsible for search functionality experiencing lower than expected availability, preventing some users from searching during peak hours. Their code fix has successfully recovered search function availability, and they have confirmed after an extended period of monitoring that the impact has been remediated by our actions.

Scope of impact: Some users in the United Kingdom who are attempting to complete searches using Outlook on the web or either the classic or new Outlook desktop apps may be impacted. This section may be updated as the investigation continues.

Next Steps: Microrosoft are continuing to monitor the affected infrastructure to verify no further optimizations are necessary to prevent this issue from reoccurring.