WINDOWS VERSION HISTORY:

WINDOWS 1.0 ------>16 Bit Os (1985)
WINDOWS 2.0 ------>16 Bit Os
WINDOWS 3.0 ------>16 Bit Os (1990)
WINDOWS 3.1 ------>16 Bit Os (1992)
WINDOWS NT 3.1 ------>32 Bit Os (1993)
WINDOWS 95 ------>Used WIN32 API
WINDOWS 98
WINDOWS ME
WINDOWS NT 4
WINDOWS 2000 (or also Known as WINDOWS NT 5)
WINDOWS XP (or also Known as WINDOWS NT 5.1)
WINDOWS XP PROFESSIONAL ----->Supports 64 Bit
WINDOWS SERVER 2003
WINDOWS VISTA (WINDOWS NT 6.0)
WINDOWS 7 (WINDOWS NT 6.1)
------->WINDOWS 7 ULTIMATE
------->WINDOWS 7 HOME PREMIUM
------->WINDOWS 7 HOME BASIC
------->WINDOWS 7 PROFESSIONAL
------->WINDOWS 7 STARTER
------->WINDOWS 7 ENTERPRISE
WINDOWS SERVER 2012
WINDOWS 8 (WINDOWS NT 6.2)
------->WINDOWS 8
------->WINDOWS 8 Pro
------->WINDOWS 8 ENTERPRISE
------->WINDOWS 8 RT (FOR TABLETS)
XP-EXTENDED PROCEDURE
NT-NEW TECHNOLOGY
RT-RUNTIME