Let see ... as an enthusiast I started out with CPM back in the 80's, moved on to MS Dos, Windows 3.1, Windows 95, 98, 2000, XP, Vista and lets not leave out Windows 7.
In the early 2000's Linux distros like SuSe 9, Mepis 5, Linux Mint 5, Ubuntu 6, 7, 8 & 9 as well as Mint XFCE 5, and also Mint 7 ... I hope I didn't leave any out
Almost forgot ... my 1st home PC the Vic-20
I like to mix things up ... so why not