List of WordPress Versions

List of wordpress Version’s 

It may help, for your doubt

Source : http://codex.wordpress.org/WordPress_Versions

Version Release Date
0.7 May 27, 2003
0.71 June 9, 2003
0.711 June 25, 2003
0.72 October 11, 2003
1.0 January 3, 2004
1.0.1 January 25, 2004
1.0.2 March 11, 2004
1.2 May 22, 2004
1.2.1 October 6, 2004
1.2.2 December 15, 2004
1.5 February 17, 2005
1.5.1 May 9, 2005
1.5.1.2 May 27, 2005
1.5.1.3 June 29, 2005
1.5.2 August 14, 2005
2.0 December 26, 2005
2.0.1 January 31, 2006
2.0.2 March 10, 2006
2.0.3 June 1, 2006
2.0.4 July 29, 2006
2.0.5 October 27, 2006
2.0.6 January 5, 2007
2.0.7 January 15, 2007
2.0.8 February 8, 2007
2.0.9 February 21, 2007
2.0.10 April 3, 2007
2.0.11 August 5, 2007
2.1 January 22, 2007
2.1.1 February 21, 2007
2.1.2 March 2, 2007
2.1.3 April 3, 2007
2.2 May 16, 2007
2.2.1 June 21, 2007
2.2.2 August 5, 2007
2.2.3 September 8, 2007
2.3 September 24, 2007
2.3.1 October 26, 2007
2.3.2 December 29, 2007
2.3.3 February 5, 2008
2.5 March 29, 2008
2.5.1 April 25, 2008
2.6 July 15, 2008
2.6.1 August 15, 2008
2.6.2 September 8, 2008
2.6.3 October 23, 2008
2.6.5 November 25, 2008
2.7 December 10, 2008
2.7.1 February 10, 2009
2.8 June 10, 2009
2.8.1 July 9, 2009
2.8.2 July 20, 2009
2.8.3 August 3, 2009
2.8.4 August 12, 2009
2.8.5 October 20, 2009
2.8.6 November 12, 2009
2.9 December 18, 2009
2.9.1 January 4, 2010
2.9.2 February 15, 2010
3.0 June 17, 2010
3.0.1 July 29, 2010
3.0.2 November 30, 2010
3.0.3 December 8, 2010
3.0.4 December 29, 2010
3.0.5 February 7, 2011
3.0.6 April 26, 2011
3.1 February 23, 2011
3.1.1 April 5, 2011
3.1.2 April 26, 2011
3.1.3 May 25, 2011
3.1.4 June 29, 2011
3.2 July 4, 2011
3.2.1 July 12, 2011
3.3 December 12, 2011
3.3.1 January 3, 2012