Update what's new

Author: cwatson-cat

articles/sentinel/whats-new.md

@@ -4,7 +4,7 @@ description: Learn about the latest new features and announcement in Microsoft S
 author: yelevin
 ms.author: yelevin
 ms.topic: concept-article
-ms.date: 01/14/2025
+ms.date: 03/17/2025
 
 #Customer intent: As a security team member, I want to stay updated on the latest features and enhancements in Microsoft Sentinel so that I can effectively manage and optimize my organization's security posture.
 
@@ -18,6 +18,21 @@ The listed features were released in the last three months. For information abou
 
 [!INCLUDE [reference-to-feature-availability](includes/reference-to-feature-availability.md)]
 
+## March 2025
+
+- [Multi workspace support for Microsoft Sentinel (preview)](#multi-workspace-support-for-microsoft-sentinel-preview)
+
+### Multi workspace support for Microsoft Sentinel (preview)
+
+For preview, in the Defender portal, connect to one primary workspace and multiple secondary workspaces for Microsoft Sentinel. If you onboard Microsoft Sentinel with Defender XDR, a primary workspace's alerts are correlated with Defender XDR data. So incidents  include alerts from Microsoft Sentinel's primary workspace and Defender XDR. All other onboarded workspaces are considered secondary workspaces. Incidents are created based on the workspace’s data and won't include Defender XDR data. 
+
+If you plan to use Microsoft Sentinel in the Defender portal without Defender XDR, you can manage multiple workspaces. But, the primary workspace doesn't include Defender XDR data and you won't have access to Defender XDR capabilities.
+
+For more information, see the following articles:
+
+- [Multiple Microsoft Sentinel workspaces in the Defender portal](workspaces-defender-portal.md)
+- [Connect Microsoft Sentinel to the Microsoft Defender portal](/unified-secops-platform/microsoft-sentinel-onboard)
+
 ## January 2025
 
 - [Optimize threat intelligence feeds with ingestion rules](#optimize-threat-intelligence-feeds-with-ingestion-rules)