I suppose it depends on the features you want. They could probably have implemented Aero Snap on Windows 95. And I'm sure the shareware authors will backport

I suppose it depends on the features you want. They could probably have implemented Aero Snap on Windows 95. And I'm sure the shareware authors will backport this sooner or later. Same with most of the changes to the task bar. On the other hand, some of the major graphical changes are probably more complex than they seem, and rely on significant changes to the guts of the OS.