Microsoft 32 bit Windows Version History

I was looking through the release dates of Microsoft's 32-bit and 64-bit Operating systems little earlier. Following are the details:

Product Name / Version No. / Release Date
Win NT 3.1 // 3.1 // July 1993
Win NT 3.5 // 3.5 // September 1994
Win NT 3.51 // 3.51 // May 1995
Win NT 4.0 // 4.0 // July 1996
Win 2000 // 5.0 // December 1999
Win XP // 5.1 // August 2001
Win Server 2003 // 5.2 // March 2003
Win Vista // 6.0 (Build 6000) // January 2007
Win Server 2008 // 6.0 (Build 6001) // March 2008
Windows 7 // 6.1(7600) // October 2009