I have written a review of Sony Ericsson Xpreia X2. This is a full-fledged business phone running Windows Mobile 6.5. Unfortunately, it is also incredibly slow, full of bugs and cumbersome to use. Stay away!
Read the full review (in Norwegian) on Amobil.no: http://www.amobil.no/artikler/sony_ericsson_xperia_x2/75064