Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Admins may notice excessive memory usage on their Windows Server 2016 machines – ONGOING

Announcements Arpan Das

01/04/2026 09:22:00 AM

NHSmail Reference: INC46787846

Microsoft Reference: DZ1266872

Issue Status: ONGOING

Issue Description: Admins may notice excessive memory usage on their Windows Server 2016 machines.

More info: Admins may notice delays or timeouts with third-party applications hosted on affected Windows Sever 2016 machines running Microsoft Defender for Endpoint’s Sense.

Current Update: 09/04/2026 08:40:00 AM– Microsoft are monitoring of the remaining impacted devices continues as we ensure our service optimizations reach these devices and no further actions are required to fully resolve the issue.

Scope of impact: Any Windows Server 2016 admin may be affected.

Next update by: Monday, April 13, 2026, at 10:00 PM UTC