XPERIA X1 from Sony Ericsson are powered by Windows Mobile. I think this is the first phone from Sony Ericsson which run windows mobile.
The XPERIA X1 features include the following:
- 3G HSDPA high-speed Internet
- Unique arc slider with wide-pitch, easy-to-use QWERTY keyboard, 3-inch clear wide VGA display and high-quality high-finish metal body
- Windows Mobile, HSDPA/HSUPA and Wi-Fi™ support so customers can enjoy their favourite entertainment and work efficiently on the move
- XPERIA™ panels to navigate Web, multimedia and other applications with the tip of a finger