Microsoft confirms that Windows Sandbox fails to launch on Windows 10 Insider build 18305.1003

Laurent Giret

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Nearly two weeks ago, Microsoft released a cumulative update for the Windows 10 Insider build 18305 to fix a vulnerability in Internet Explorer. Unfortunately, if you have already installed the build 18305.1003 (KB4483214), the Redmond giant has confirmed that it breaks Windows Sandbox as well Windows Defender Application Guard.

Microsoft quietly added this known issue to the release notes for the build 18305 yesterday. If you really want to use Windows Sandbox, the only workaround as of today is to uninstall this update from the Windows 10 Settings app. On Microsoft’s Answers website, Windows Insider Pauli O also provided steps on how to hide this update (via Tero Alhonen).

If you haven’t tried it yet, Windows Sandbox is a temporary desktop environment where Windows admins can safely test untrusted software. Compared to traditional VM solutions, Windows Sandbox will permanently delete all your apps and their related files once you close it, which means you can start with a clean slate the next time you use the feature.

Windows Sandbox promises to be a very interesting addition for the upcoming 19H1 update for Windows 10, and you can learn more about it in our previous hands-on video.