Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be experiencing high latency when performing searches in Exchange Online – RESOLVED

05/05/2026 08:42:00 AM

NHSmail Reference: INC46815876

Microsoft Reference: EX1297752

Issue Status: RESOLVED

Issue Description: Users may be experiencing high latency when performing searches in Exchange Online

Final Update: 06/05/2026 08:42:00 AM– Microsoft has monitored service health telemetry and validated that their service optimizations to expand available resources and reduce overall latency successfully alleviated latency, resolving the issue.

Scope of impact: This issue may impact any user attempting to perform searches in Outlook, Outlook on the web, or Outlook mobile.

Root cause: Outsised loads on service infrastructure from increased traffic and ongoing improvements is causing search latency issues and resulting in impact.

Next Steps: Microsoft are investigating the impacted service infrastructure determine why the increased volume of service requests and ongoing improvements caused search latency issues to prevent this problem from happening again in the future.