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> Microsoft says they are working to merge all the shell differences into a single project (CShell; composable shell), and the point of getting to a clean core (the "Polaris" codename in this article)

The clean core is Windows Core OS; Polaris is the desktop-specific composer on top of CShell and Windows Core OS and is also used in this article as the name of a UWP-only Windows edition incorporating the Core OS/CShell/Polaris-composer stack.

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Do you have a source for your specifics? From the linked article I assumed that Polaris was just the new codename for the next big phase of Windows Core OS/OneCore/etc work and the article was mistaken or presuming much about a Core/CShell-only edition release plan.

It makes sense that there would be a codename for the desktop-composer on top of CShell, and that would be a far better explanation of things than the article here.

Here's an article which discusses the strategy in some more detail, explicitly identifying Polaris as the composer (but then also seeming to use it as the name for a desktop spin of Windows with Polaris in the stack):

https://www.windowscentral.com/windows-core-polaris

This Windows Central article actually seems to be the source for most of the other recent coverage, so it may be the most complete piece out there.

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