行動作業系統
Sony Ericsson launched their first Windows Mobile device in 2008, the Xperia X1, at the 2008 Mobile World Congress in Barcelona, which carried the Windows Mobile operating system with a Sony Ericsson panel interface and was manufactured by HTC. They would further develop two more Windows Mobile devices: Sony Ericsson Xperia X2 and Sony Ericsson Aspen in 2010. By this time, Sony Ericsson switched all its focus on Google's Android operating system. The company's CEO did confirm a Sony Ericsson Windows Phone device for 2011. A prototype exists and was leaked on the internet in 2011, but no Windows Phone device was ever released.