Pocket PC 2000, originally codenamed “Rapier”, was released on April 19, 2000, and was based on Windows CE 3.0.
Pocket PC 2002, originally codenamed “Merlin”,was released in October 2001. Like Pocket PC 2000, it was powered by windows CE 3.0.
Windows Mobile 2003, originally codenamed “Ozone”,was released on June 23, 2003,Windows Mobile 2003 was powered by Windows CE 4.20.
Windows Mobile 2003 Second Edition, also known as “Windows Mobile 2003 SE”, was released on March 24, 2004
Windows Mobile 5.0, originally codenamed “Magneto”,was released on May 9–May 12, 2005.
Windows Mobile 6, formerly codenamed “Crossbow”,was released on February 12, 2007 and was powered by Windows CE 5.0.
Windows Mobile 6.1 was announced April 1, 2008. It is a minor upgrade to the existing Windows Mobile 6 and is powered by WM 6.1, the CE version is 5.2.
Windows Mobile 6.1 was announced May 11, 2009.
Codenamed “Photon”, Windows Mobile 7 is a major upgrade planned for release in 2010, and a beta is planned to be released to testers during November 2009.
