> WinXP Never heard about the Windows NT operating system series? WinNT series: WinNT 3.5 (1988-1994, based on VMS a bit on OS/2 designs) -> WinNT 4 -> Win20

> WinXP Never heard about the Windows NT operating system series? WinNT series: WinNT 3.5 (1988-1994, based on VMS a bit on OS/2 designs) -> WinNT 4 -> Win2000 -> WinXP (August 24th 2001) -> WinVista -> Win7 -> Win8x -> Win10 (2015) [exluding all service packs] MacOS X: NeXTSTEP (1987-1989, based on Unix) -> OPENSTEP -> Rhapsody (1997) -> Mac OS X Server 1.0 -> Mac OS X Public Beta -> Mac OS X 10.0 (March 24th 2001, this is the first MacOS X you know) -> 10.1 -> 10.2 -> 10.3 -> 10.4 -> 10.5 -> 10.6 -> 10.7 -> 10.8 -> 10.9 -> 10.10 -> 10.11 (= El Capitan, 2015)