Windows 10 21H1 for desktop will be build 19043

As predicted earlier, Microsoft will release Windows 10 version 21H1 in the form of a cumulative update. It will be a minor release, whereas version 21H2 will be a major feature update to the OS. This is now confirmed, and the RTM build for 21H1 will be build 19043.

Windows 10 21H1 Banner

The information comes from Zac Bowden, who communicates with internal sources at Microsoft. He has finally managed to receive a confirmation regarding the upcoming 21H1 release.


Microsoft is planning a big Windows 10 update in the second half of 2021 that will introduce new top-level features and a new user interface which is more modern and consistent. There will be a focus on wider adoption of WinUI in the Windows Shell and native applications, an updated taskbar built with modern code and an improved user interface for the old File Explorer.

The user interface changes are now known as 'Sun Valley'.

Microsoft is already working on Windows 10 21H2

Microsoft will still issue two feature updates in 2021 as per the biannual update scheme. However, the significance of the updates will be reversed. The Spring update, version 21H1, will be a smaller service pack-like update, similar to what we have already seen in Windows 10 20H2 and 1909. The bigger one with more notable changes, 21H2, will come in the second half of 2021.

What’s coming to Windows 10 in 2021

Windows 10 21H1 (minor update) will be released early next year followed by the major Windows 10 21H2 in the fall. Windows Insiders can already test Windows 10 21H1 update, but in addition to this, the company is also working to launch preview builds of the 21H2 update.

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Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

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