Add a note about download (un)availability

Author: dimitri-furman

support/sql/releases/includes/database-mail-stops.md

@@ -2,6 +2,6 @@ Database Mail stops working after you install this cumulative update. You might
 
 > Could not load file or assembly 'Microsoft.SqlServer.DatabaseMail.XEvents, Version=17.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.
 
-If you use Database Mail, don't install this update until a fix is available.
+If you already downloaded this cumulative update and currently use or plan to start using Database Mail, don't install this update until a fix is available.
 
-If you already installed this update, [uninstall it](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) to restore Database Mail.
+If you already installed this update, [uninstall it](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) to restore Database Mail functionality.

support/sql/releases/sqlserver-2022/cumulativeupdate23.md

@@ -17,6 +17,9 @@ _Version:_   16.0.4235.2
 
 ## Summary
 
+> [!NOTE]  
+> This cumulative update is temporarily unavailable for download because of a [known issue related to Database Mail](#database-mail-stops-working-after-updating).
+
 This article describes Cumulative Update package 23 (CU23) for Microsoft SQL Server 2022. This update contains 15 [fixes](#improvements-and-fixes-included-in-this-update) that were issued after the release of SQL Server 2022 Cumulative Update 22. It updates components in the following builds:
 
 - SQL Server - Product version: **16.0.4235.2**, file version: **2022.160.4235.2**

support/sql/releases/sqlserver-2025/cumulativeupdate1.md

@@ -17,6 +17,9 @@ _Version:_   17.0.4005.7
 
 ## Summary
 
+> [!NOTE]  
+> This cumulative update is temporarily unavailable for download because of a [known issue related to Database Mail](#database-mail-stops-working-after-updating).
+
 This article describes Cumulative Update package 1 (CU1) for Microsoft SQL Server 2025. This update contains 16 [fixes](#improvements-and-fixes-included-in-this-update) that were issued after the initial release of SQL Server 2025. It updates components in the following builds:
 
 - SQL Server - Product version: **17.0.4005.7**, file version: **2025.170.4005.7**