The latest rumour to be going around the web regarding Sony Ericsson and their Xperia range of handsets, is a Windows Phone 7 handset, dubbed the Xperia X7. The existence of an Xperia handset running WP7 is very plausible, as is the fact that it could run be named the Xperia X7, however the specs of the handset leads us to believe the rumor is most likely fake.