Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be unable to search in Exchange Online using Outlook on the web or the new Outlook client – RESOLVED

20/03/2025 08:30:00 AM

NHSmail Reference: INC46480385

Microsoft Reference: EX1035922

Issue Status: RESOLVED

Issue Description: Users may be unable to search in Exchange Online using Outlook on the web or the new Outlook client.

More info: Affected users may have seen the following error message “they didn’t find anything, try a different keyword” when performing searches in Exchange Online.

Final Update: 20/03/2025 08:35:00 AM – After validating with a subset of affected users, Microsoft have confirmed that impact is resolved. For affected users that are still experiencing search failures, restarting or refreshing Outlook on the web or the new Outlook client will resolve any lingering search issues.

Scope of impact: Impact was specific to some users, who were served through the affected infrastructure, attempting to search in Exchange Online.

Root cause: A recent Exchange Online update introduced a code error, which caused some users to been unable to search in Exchange Online using Outlook on the web or the new Outlook client.

Next steps: Microsoft are continuing to analyze and evaluate the affected Exchange Online update that introduced the code error to understand why impact wasn’t caught during the update testing and validation phase. This will help to prevent similar impact from occurring in future and to continue our ongoing efforts to improve the resiliency of our service for all users.