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Release Date:



OS Build 17784.1737

NEW 5/25/21

IMPORTANT Azure HCI, version 21H2 is available for preview. To learn more, see Join the preview channel.

Improvements and fixes

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

  • Improves the PowerShell cmdlets used by the Automatic VM Activation (AVMA) UI within the Windows Admin Center.

  • Addresses an issue with modules for AVMA PowerShell commands.

  • Addresses an issue that puts a cluster in an unregistered state when it receives “resource not found” errors from Azure for two consecutive days.

To return to the Azure Stack HCI documentation site

Known issues in this update



You might have issues installing this update by using the Windows Admin Center or Cluster Aware Updating (CAU) through the Windows Update Plugin.

This issue is resolved in KB5004311.

How to get this update

The May 18, 2021 preview update (KB5003237) for Azure Stack HCI 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 5003237.

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