Windows 10 21H1 is expected to be only a minor update, with the real action expected with Windows 10 21H2.

That OS update is expected to ship with Microsoft’s new and secret “Sun Valley” UI, with improvements to the classic File Explorer, Windows Start Menu, Action Center, and even taskbar.

Now WindowsLatest reports that Microsoft has already started testing the OS internally, with Windows 10 Build 21264.

Microsoft is reportedly reluctant to acknowledge this update, as there is a good possibility the timescales may slip, given its size and complexity.

We’ll keep our readers apprised of any developments as news of this significant update trickles out more.

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