These days the similarities are greater than the differences in OSs. I mainly use Windows Xp for work and business and love playing around with retro OSs for fun and amusement. These include but are not limited to: Amiga OS 3.1, Atari TOS 2.06, MSDOS 6.2, Windows NT 4.0, OS/2 Warp 4.0. I just sold a Mac laptop that I got broken and fixed and had no problems reajusting to OSX after a couple of years in the Windows world. And I should add various versions of Palm OS, Symbian and the, latest addition, Android. In fact, the difference between Symbian and Android kind of reminds me of Atari TOS vs Amiga OS.
