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Release Date:



OS Build 20348.75

Improvements and fixes

This public preview non-security update includes quality improvements. Key changes include:

  • Addresses an issue with Kernel Soft Reboot (KSR).    

  • Addresses an issue that displays progressive web application (PWA) icons as blank when you pin them to the taskbar.

  • Addresses an issue that prevents the icon for a Toast collection from appearing in the Action Center if the icon file’s URI contains spaces.

  • Addresses an issue in Windows Search that prevents a custom word breaker from working properly.

  • Addresses an issue that prevents sorting from working properly when using multiple versions of National Language Support (NLS) sorting.

  • Addresses a performance issue in the MultiByteToWideChar() function that occurs when it is used in a non-English locale.

  • Addresses an issue that might prevent the Windows Dynamic Host Configuration Protocol (DHCP) Server from offering a lease to a DHCPv6 client after the client moves to a different virtual LAN (VLAN).

  • Addresses an issue that fails to register a DNS update to an A record and a PTR when Azure virtual machines update against corporate DNS zones.

  • Addresses an issue with the hypervisor classic scheduler that occurs on devices that have certain processors. The scheduler might remain in a loop when it attempts to find an idle CPU for a virtual processor (VP) thread.

  • Addresses an issue with NodeId emulation in the processor topology definition for the CPUID leaf.

  • Adds support for the USBTest and MeasurementClass.

  • Addresses an issue in Adamsync.exe that affects the syncing of large Active Directory subtrees.

  • Addresses a redirector stop error that is caused by a race condition that occurs when the system deletes binding objects when connections close.

  • Addresses an issue that causes setup for a Server Message Block (SMB) session to fail because of a service principal name (SPN) validation failure.

  • Addresses an issue that causes some Enhanced Metafiles (EMF) to render incorrectly. This issue occurs when you use third-party applications that create EMFs using ExtCreatePen() and ExtCreateFontIndirect().

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

The June 24, 2021 public preview update (KB5003706) for Azure Stack HCI, version 21H2 public preview is delivered from the release channels below. To install it on your Azure Stack HCI cluster, see Update Azure Stack HCI clusters.

Install this update

Release Channel


Next Step

Windows Update and Microsoft Update


Go to Settings Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.

Windows Update for Business


None. These changes will be included in the next security update to this channel.

Microsoft Update Catalog


To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Services (WSUS)


You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

File Information

For a list of the files that are provided in this update, download the file information for cumulative update 5003706.

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