Sony may add a Windows Phone device to its VAIO product line in mid-2014. The only operating system currently on Sony smartphones is Android. The last Sony mobile device running Windows OS was the Sony Ericsson Aspen launched in 2010. Microsoft would welcome this move since it will increase the share of Windows Phone in the smartphone OS market, which is dominated by Google and Apple. Nowadays the only devices running Windows Phone are Nokia smartphones. Nokia's devices unit was acquired by Microsoft in September 2013.