Windows Operating System Version till now!!!

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 SERVER 2012
WINDOWS 8
XP-EXTENDED PROCEDURE
NT-NEW TECHNOLOGY
RT-RUNTIME