I had trouble syncing my MS Outlook calendar with my HTC Desire - appointments would go in one direction, but not the other. Several sources suggested this was because I was using an old version of Outlook (2002, so seemed fair criticism). However, since I have upgraded to Outlook 2010, HTC Sync doesn't shift Calendar information in either direction! The 'Calendar' option on the HTC Sync screen is greyed out. There is some kind of connection between phone and PC (Win XP SP3), because I have succeeeded in moving photos, so this seems likely to be a software issue. Any suggestions?