KB5003212 and KB5003217 Non-Security Updates Are Available for Some Versions of Windows 10
https://wccftech.com/windows-10-update-kb5003212-kb5003217-non-security-is-out/
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Microsoft has released May 2021 monthly "C" release preview updates for Windows 10 versions 1909 and 1809. These non-security preview updates will also be made available for versions 21H1, 20H2, and 2004 later on.