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

Title: Users may be experiencing high latency when performing searches in Exchange Online User impact: Users may have experienced high latency when performing searches in Exchange Online. Final status: We’ve monitored service health telemetry and validated that our service optimizations to expand available resources and reduce overall latency successfully alleviated latency, resolving the issue. Scope of impact: This issue may have impacted any user attempting to perform searches in the Outlook desktop client, Outlook on the web, or Outlook mobile. Start time: Wednesday, April 01, 2026, at 7:00 AM UTC End time: Friday, May 01, 2026, at 11:00 PM UTC Root cause: A portion of the Exchange Online service infrastructure was operating in a suboptimal state due to an increased volume of service requests and ongoing improvements, resulting in search latency and impact. Next steps: We’re 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. This is the final update for the event.

Title: Users may be experiencing high latency when performing searches in Exchange Online User impact: Users may be experiencing high latency when performing searches in Exchange Online. Current status: We're continuing to monitor service health telemetry to validate that latency is successfully alleviated following our service optimizations aimed at expanding available resources and reducing overall latency. We'll provide a timeline for impact remediation as once becomes available. Scope of impact: This issue may impact any user attempting to perform searches in Outlook, Outlook on the web, or Outlook mobile. Start time: Wednesday, April 01, 2026, at 7:00 AM UTC Root cause: Outsized loads on service infrastructure from increased traffic and ongoing improvements is causing search latency issues and resulting in impact. Next update by: Tuesday, May 05, 2026, at 6:00 PM UTC

Title: Users may be experiencing high latency when performing searches in Exchange Online User impact: Users may be experiencing high latency when performing searches in Exchange Online. Current status: After determining that the source of impact is related to high loads on service infrastructure, we've implemented optimizations to expand available resources and reduce latency. We're monitoring service health telemetry to ensure that latency is successfully alleviated. Scope of impact: This issue may impact any user attempting to perform searches in Outlook, Outlook on the web, or Outlook mobile. Start time: Wednesday, April 01, 2026, at 7:00 AM UTC Root cause: The search latency was caused by outsized loads on service infrastructure from increased traffic and ongoing improvements. Next update by: Monday, May 04, 2026, at 6:00 PM UTC

Title: Users may be experiencing high latency when performing searches in Exchange Online User impact: Users may be experiencing high latency when performing searches in Exchange Online. Current status: We're reviewing service health telemetry to isolate the source of impact and identify any errors which may be contributing to search latency. Scope of impact: This issue may impact any user attempting to perform searches in Outlook, Outlook on the web, or Outlook mobile. Next update by: Friday, May 01, 2026, at 7:30 PM UTC

Title: Users may be experiencing high latency when performing searches in Exchange Online User impact: Users may be experiencing high latency when performing searches in Exchange Online. Current status: We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.