Microsoft has quietly released an update for Microsoft Validation OS, a lightweight distribution of Windows 11, without any official announcement. The updated ISOs for Validation OS are now available, but this particular operating system is not intended for end-users.
Microsoft Validation OS is primarily designed for hardware or software vendors, developers, and technicians, providing a command-line (CLI) environment to diagnose and troubleshoot issues. It offers increased reliability in factory settings and supports running Win32 applications.
The updated ISOs for Validation OS are now based on build 22621.1702. Microsoft previously released updated ISOs for the Moment 2 22H2 feature as well.
To download Microsoft Validation OS, users can access the Windows Image (.WIM) file from this link, available for both arm64 and amd64 architectures.
This console-based Windows 11 Validation OS serves as a recovery environment, allowing IT professionals and system administrators to diagnose, mitigate, and resolve various issues. It supports the execution of Win32 apps, extending beyond built-in tools. The OS can be freely downloaded as an ISO file after accepting the associated license agreement on the provided website.
Given its specialized nature, Microsoft did not officially announce this edition update of Windows 11 on its blogs or news platforms. It is possible that the company directly notified vendors about the new ISO images.
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The main reason they updated the Validation OS image to 22621.1702 is because the May 9, Security Update is recommended to be installed on all 22621 systems by Microsoft, including Windows PE.