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Did Vista's kernel break from XP's in some significant way? I've never heard anything indicating that Vista/7/8/10 were a new kernel, and not a continuation of the NT line.

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There are only two code lines. The original 3.x and the NT 4.x. Everything starting with 2000/XP was a derivative of the first NT kernel.

It's a small nitpick, but the first version of NT was 3.1. It was a separate codebase from Windows 3.1, of course.

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