MinWin isn't a feature or a kernel or a product. It's more like a set of guidelines and principles, kind of like how SDL (Secure Development Lifecycle) guides our development process toward more secure software, the MinWin effort guides Windows components to
fit into a more clearly and well-defined layered architecture.
No one asks if Vista or Win7 "has SDL in it." And yet that's what it sounds like when someone says Win7 does or doesn't "have minwin."