KyL416:He likely means version wise and the basic core of the OS:
Windows 95 was version 4.0, 98 was version 4.1, ME was 4.9
2000 was 5.0, XP was version 5.1, 2003 Server was 5.2
Vista was 6.0, and the Windows 7 preview was 6.1 as opposed to 7.0
i.e. most drivers worked between 95, 98 and ME, but had to be rewritten for 2000, XP and 2003, and then rewritten again for Vista
Nope, Most Drivers written for XP or even 2000 (limited with 2000) will work with Windows Vista, I can give you many devices that only had XP drivers and with those drivers works perfect under Vista (Modems, digital cameras, scanners, printers) but, not in every case.
-Dave
MCP, MCSA, MCSE 2003
Windows Vista Connected Exp:Home Theater for Technologists
Windows Vista Connected Exp:Home Theater for Sales professionals
Home theater specialist (10+ years)