Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Some users may be unable to search for content in SharePoint Online, OneDrive, Outlook on the web, or Outlook desktop – ONGOING

Announcements Shagufta Naaz

18/07/2026 08:54:00 AM

NHS.net Connect Reference: INC46911643

Microsoft Reference: MO1456424

Issue Status: ONGOING

Issue Description: Some users may be unable to search for content in SharePoint Online, OneDrive, Outlook on the web, or Outlook desktop.

Current Update: 18/07/2026 08:48:00 AM – Microsoft’s investigation identified that a recent deployment introduced a resource utilisation inefficiency issue, leading to impact. They have developed and are deploying a fix to reduce the resource pressure and restore service. They are monitoring as this progresses to identify a completion timeline.

Scope of impact: Impact is specific to some users served through the affected infrastructure who are attempting to search for content in SharePoint Online, OneDrive, Outlook on the web, or Outlook desktop. This section may be updated as our investigation continues.

Root cause: A recent deployment introduced a resource utilization inefficiency issue, leading to impact.

Next update by: Friday, August 21, 2026, at 4:00 AM UTC