Merge pull request #4653 from YongRhee-MSFT/docs-editor/whats-new-in-microsoft-defende-1754317512

Update whats-new-in-microsoft-defender-endpoint.md

Author: paulinbar

defender-endpoint/whats-new-in-microsoft-defender-endpoint.md

@@ -46,6 +46,10 @@ For more information on what's new with other Microsoft Defender security produc
 - [What's new in Microsoft Defender for Cloud Apps](/cloud-app-security/release-notes)
 - [What's new in Microsoft Defender Vulnerability Management](/defender-vulnerability-management/whats-new-in-microsoft-defender-vulnerability-management)
 
+## July 2025
+
+- (GA) [Microsoft Defender Core service](/defender-endpoint/microsoft-defender-core-service-overview) is now generally available on Windows Server 2019 or later.  Helps with the stability and performance of Microsoft Defender Antivirus.
+
 ## April 2025
 
 - (Preview) **Contain IP addresses of undiscovered devices**: Containing IP addresses associated with devices that are undiscovered or are not onboarded to Defender for Endpoint is now in preview. Containing an IP address prevents attackers from spreading attacks to other non-compromised devices. See [Contain IP addresses of undiscovered devices](respond-machine-alerts.md#contain-ip-addresses-of-undiscovered-devices) for more information.