The world's fourth largest mobile phone manufacturer, Sony Ericsson, and Microsoft have begun cooperating to launch a Windows Mobile-based smartphone. This phone, model XPERIA X1, will be available for purchase by the end of this year and will include a QWERTY keyboard and a touch screen. With another victory for Windows Mobile in its quest for dominance in smartphone systems, what is the final target? Naturally, it's Nokia. Horn, the head of Microsoft's relevant affairs department, commented: Why not equip all mobile phone brands with Windows?