[qplex]

In my experience, users were rather confused and lost with the UI overhaul in Windows Vista.

With Windows 8 users could not even figure out how to log in to the system.

Windows 9x/NT/2000/XP was more consistent.

>The Linux/Unix world is much more sustainable. You can likely still use applications which were written twenty years ago.

It's true that the kernel API on Linux is quite stable, but that doesn't get you very far with most applications, since they are usually linked against some old library, which depends on another old library etc.