Update in-place-migration-technical-details.md

Author: hirenshah1

articles/cloud-services-extended-support/in-place-migration-technical-details.md

@@ -14,6 +14,9 @@ ms.author: hirshah
 
 # Technical details of migrating to Azure Cloud Services (extended support)   
 
+> [!IMPORTANT]
+> As of March 31, 2025, cloud Services (classic) is deprecated and will be fully retired on March 31, 2027. [Learn more](https://aka.ms/csesretirement) about this deprecation and [how to migrate](https://aka.ms/cses-retirement-march-2025).
+
 This article discusses the technical details regarding the migration tool as pertaining to Cloud Services (classic). 
 
 ## Details about feature / scenarios supported for migration