What's new in Windows 10, version 21H1 - What's new in Windows
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/whats-new/whats-new-windows-10-version-21H1
WebDec 31, 2017 · This article lists new and updated features and content that is of interest to IT Pros for Windows 10, version 21H1, also known as the Windows 10 May 2021 Update. This update also contains all features and fixes included in previous cumulative updates to Windows 10, version 20H2.
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