update 4B,4D,5B and add 6B release notes and toc update

docs/framework/release-notes/2024/04-09-april-security-and-quality-rollup.md

@@ -112,3 +112,5 @@ The following table is for earlier Windows and Windows Server versions for Secur
 | .NET Framework 2.0, 3.0 | [5036633](https://support.microsoft.com/kb/5036633) |
 | .NET Framework 3.5 SP1 | [5036636](https://support.microsoft.com/kb/5036636) |
 | .NET Framework 4.6.2 | [5036631](https://support.microsoft.com/kb/5036631) |
+
+The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be installed based on the version of .NET Framework that is already present on the device. Because of this the operating system KB is not expected to be listed as installed updates on the device. The expected update to be installed are the .NET Framework specific version updates listed in the preceding table.

docs/framework/release-notes/2024/04-23-april-preview-cumulative-update.md

@@ -55,3 +55,5 @@ The following table outlines the updates in this release.
 | **Windows 10, version 22H2** | **[5037724](https://support.microsoft.com/kb/5037724)** |
 | .NET Framework 3.5, 4.8 | [5037592](https://support.microsoft.com/kb/5037592) |
 | .NET Framework 3.5, 4.8.1 | [5037587](https://support.microsoft.com/kb/5037587) |
+
+The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be installed based on the version of .NET Framework that is already present on the device. Because of this the operating system KB is not expected to be listed as installed updates on the device. The expected update to be installed are the .NET Framework specific version updates listed in the table above.

docs/framework/release-notes/2024/05-14-may-security-and-quality-rollup.md

@@ -91,3 +91,5 @@ The following table is for earlier Windows and Windows Server versions for Secur
 | .NET Framework 2.0, 3.0 | [5036625](https://support.microsoft.com/kb/5036625) |
 | .NET Framework 3.5 SP1 | [5036637](https://support.microsoft.com/kb/5036637) |
 | .NET Framework 4.6.2 | [5037917](https://support.microsoft.com/kb/5037917) |
+
+The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be installed based on the version of .NET Framework that is already present on the device. Because of this the operating system KB is not expected to be listed as installed updates on the device. The expected update to be installed are the .NET Framework specific version updates listed in the table above.

docs/framework/release-notes/2024/06-25-june-preview-cumulative-update.md

@@ -0,0 +1,45 @@
+---
+title: June 2024 cumulative update preview
+description: Learn about the improvements in the .NET Framework June 2024 cumulative update preview.
+ms.date: 06/25/2024
+---
+# June 2024 cumulative update preview
+
+_Released June 25, 2024_
+
+## Summary of what's new in this release
+
+- [Security improvements](#security-improvements)
+- [Quality and reliability improvements](#quality-and-reliability-improvements)
+
+### Security improvements
+
+There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.
+
+### Quality and reliability improvements
+
+#### .NET fundamentals
+
+Addresses an issue with x509 certificate use under PPL in Azure AD
+
+#### Winforms
+
+Addresses an issue with the size of memory leaks associated with AccessibleObjects held in memory due to ref-counting
+
+## Known Issues in this Release
+
+This release contains no known issues.
+
+## Summary tables
+
+The following table outlines the updates in this release.
+
+| Product version | Cumulative update preview |
+| --- | --- |
+| **Windows 11, version 22H2 and Windows 11, version 23H2** | |
+| .NET Framework 3.5, 4.8.1 | [5039866](https://support.microsoft.com/kb/5039866) |
+| **Windows 10, version 22H2** | **[5040370](https://support.microsoft.com/kb/5040370)** |
+| .NET Framework 3.5, 4.8 | [5039867](https://support.microsoft.com/kb/5039867) |
+| .NET Framework 3.5, 4.8.1 | [5039865](https://support.microsoft.com/kb/5039865) |
+
+The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be installed based on the version of .NET Framework that is already present on the device. Because of this the operating system KB is not expected to be listed as installed updates on the device. The expected update to be installed are the .NET Framework specific version updates listed in the table above.

docs/framework/toc.yml

@@ -677,6 +677,8 @@ items:
       href: release-notes/2024/04-23-april-preview-cumulative-update.md
     - name: May 2024 security and quality rollup
       href: release-notes/2024/05-14-may-security-and-quality-rollup.md
+    - name: June 2024 cumulative update preview
+      href: release-notes/2024/06-25-june-preview-cumulative-update.md
   - name: What's new
     href: whats-new/index.md
   - name: What's new in accessibility