Overview :

Windows Mobile is a mobile operating system developed by Microsoft that was used in smartphones and mobile devices, but is being currently phased out to specialized markets.It is superseded by Windows Phone 7.

The current and last version is "Windows Mobile 6.5". It is based on the Windows CE 5.2 kernel, and features a suite of basic applications developed with the Microsoft Windows API. It is designed to be somewhat similar to desktop versions of Windows, feature-wise and aesthetically. Additionally, third-party software development is available for Windows Mobile, and software applications can be purchased via the Windows Marketplace for Mobile.

Originally appearing as the Pocket PC 2000 operating system, most Windows Mobile devices come with a stylus pen, which is used to enter commands by tapping it on the screen.Microsoft announced a completely new phone platform, Windows Phone 7, at the Mobile World Congress in Barcelona on February 15, 2010. Phones running Windows Mobile 6.x will not be upgradeable to version 7,officially. Several developers however, have ported Windows Phone 7 to devices natively running Windows Mobile, an example being the HTC HD2.

Windows Mobile's share of the smartphone market has fallen year-on-year,decreasing 20% in Q3 2009.It is the 5th most popular smartphone operating system, with a 5% share of the worldwide smartphone market (after Symbian, BlackBerry OS, Android and iOS).In the United States, it is the 3rd most popular smartphone operating system for business use (after BlackBerry OS and iPhone), with a 24% share among enterprise users.Microsoft is phasing out Windows Mobile to specialized markets, such as rugged devices, and focusing on its new mobile platform, Windows Phone 7

Official Website: http://www.microsoft.com/windowsmobile/en-in/default.mspx

Official Documentation: http://create.msdn.com/en-US/