If you can't get BT sync to work odds are it's because you're not using the Microsoft BT driver. There's a RIM knowledgebase article on this which probably duplicates whatever is in that thread but it should be easier to read.
Originally Posted by Dubdub
From everything I have seen and heard, BT on the 8700 is only enabled for voice, not data.
It's definitely not voice-only unless all the GPS users are just imagining that they're using GPS... ;)