Microsoft already confirmed that Windows 7 will have Windows Vista as its foundation. Like it or not, Windows 7 will be nothing more than an evolution of the current Windows client. According to the little details the Redmond company did manage to make public, the Vista architecture will survive into the next generation of the Windows operating system, and one illustrative example in this context are the system tools. Of course that, at this point in time, the real question is just how much of Windows Vista will be Windows 7? Judging by Windows 7 Milestone 1 this is not the case at all. The fact of the matter is that Windows 7 is much more Windows Vista than it is Windows 7. Still, M1 was nothing more than an early development milestone, the first taste that Microsoft gave of the next iteration of the operating system


Source: Softpedia