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Release Date:



OS Build 20348.143

Improvements and fixes

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

  • Addresses an issue with searchindexer. After you sign out, searchindexer continues to hold handles to the per user search database in the profile path, “C:\Users\username\AppData\Roaming\Microsoft\Search\Data\Applications\<SID>\”. As a result, searchindexer stops working and duplicate profile names are created. 

  • Addresses an issue that prevents communication between apps from working when you enable the AppMgmt_COM_SearchForCLSID policy.

  • Addresses an issue that prevents gaming services from opening certain games for desktop users.

  • Updates SHA-1 binaries to SHA-2 versions.

  • Addresses an issue that might cause applications to stop working while you are typing Japanese using the Microsoft Japanese Input Method Editor (IME) in compatibility mode.

  • Addresses an issue that might cause File Explorer (explorer.exe) to consume high amounts of memory because of a heap leak.

  • Addresses an issue that causes File Explorer to stop working after reaching 99% completion when you are deleting many files on a mapped network drive.

  • Addresses an issue that causes the sleep time defined in HKLM\Software\Microsoft\AppV\MAV\Configuration\MaxAttachWaitTimeInMilliseconds to be shorter than intended.

  • Addresses an issue that repeatedly rebuilds the Windows Filtering Platform (WFP) filters. This issue occurs when a device is enrolled in a mobile device management (MDM) service and “MDMWinsOverGP” is set.

  • Addresses an issue that prevents certain screen reader apps from running when Hypervisor-protected code integrity (HVCI) is enabled.

  • Addresses an issue with auditing events 4624 and 5142 that display the wrong event template when Dutch is the display language.

  • Addresses an issue in System Integrity that allocates memory instead of freeing memory.

  • Addresses an issue that plays the sound for selecting something in a game loudly when you press the trigger button on a game controller.

  • Adds support for VMware virtual ethernet driver and paravirtual storage driver.

  • Addresses an issue that causes printing to stop or prints the wrong output. This issue occurs when you print using a USB connection after updating to Windows 10, version 2004 or later.

  • Addresses hardware configurations issues, specifically for servers with an interrupt-based baseboard management controller (BMC).

  • Addresses an issue that might cause the system time to be wrong by an hour after a daylight savings time (DST) change.

  • Addresses a rare issue that might degrade performance in applications that call Gdiplus.dll!GdipMeasureString in a tight loop with a new font on each call. This issue occurs after installing Windows updates released on and after February 2021.

  • Addresses an issue with Azure Virtual Desktop (AVD) that causes the Windows Sound settings app to display a blank list of output devices. This issue occurs when you plug in a new audio device during an AVD session.

  • Addresses an issue that might prevent an application screen from opening when you use a Remote Desktop ActiveX embedded control in a HTML page.

  • Addresses an issue that always displays devices that RemoteFX USB redirects as "Remote Desktop Generic USB Device" instead of the actual device name.

  • Addresses an issue in which Set-RDSessionCollectionConfiguration does not set the camerastoredirect:s:value custom property.

  • Addresses an accessibility issue that prevents certain screen readers from narrating the page.

  • Addresses an issue that might cause endless replication when you promote a new domain controller and the Active Directory Recycle Bin feature is enabled.

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

  • Addresses an error that occurs when the Lightweight Directory Access Protocol (LDAP) bind cache is full, and the LDAP client library receives a referral.

  • Addresses a Local Security Authority Subsystem Service (LSASS) domain controller memory leak that is reported in Privileged Access Management (PAM) deployments.

  • Addresses an issue that prevents access to files on a Server Message Block (SMB) share when you enable Access Enabled Enumeration (ABE).

  • Addresses an issue that prevents the Windows Server service from starting if SrvComment is greater than 128 characters.

  • Addresses an issue that prevents you from reconnecting to mapped network drives after you sign in and displays an access denied error. This issue occurs if you use the net use /deep option to create multiple drive mappings to different paths on the same encrypted file share.

  • Addresses an issue in the Windows Network File System (NFS) client that might prevent you from renaming a file after mounting an NFS share. This issue occurs if you rename the file using File Explorer, but does not occur if you rename the file using command line.

  • Addresses an issue that causes a stop error or causes a device to stop responding when you play a game in full-screen or tablet mode.

  • Addresses an issue that makes high dynamic range (HDR) screens appear much darker than expected. 

Known issues in this update

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

How to get this update

The July 27, 2021 public preview update (KB5004303) 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 5004303.

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