Windows Mobile 2003

Windows Mobile 2003, originally codenamed "Ozone", is a discontinued mobile operating system and member of the Windows Mobile family. It was released on June 23, 2003, and was the first Microsoft OS to be called "Windows Mobile". It was based on Windows CE 4.20.
Editions.
Windows Mobile 2003 came in four editions:
Features.
The communications interface was enhanced with Bluetooth device management which allowed for Bluetooth file transfer support, Bluetooth headset support and support for Bluetooth add-on keyboards.
A pictures application with viewing, cropping, e-mail, and beaming support was added.
Multimedia improvements included MIDI file support as ringtones in Phone Edition and Windows Media Player 9.0 with streaming optimization.
A puzzle game titled "Jawbreaker" was among the pre-installed programs. Games API was included with this release to facilitate the development of games for the platform.
Other features/built-in applications included: