Rumours abound that Sony Ericsson might make the SE Xperia X2 their last Windows Mobile device.

A tweet by Eldar Murtazin, who runs mobile-review.com, low sales forecasts (on the X1 and X2?) are causing them to re-think their commitment to the Windows Mobile platform. The SE Xperia X3 “Rachael” has already been confirmed to be an Android device, but the upcoming X2 is launching with Windows Mobile 6.5.

Most people doubt Windows Mobile 6.5 will stop the steady market share slide Microsoft is experiencing, so let’s hope Windows Mobile 7 does the trick.