I got a Pro account and setup MilkSync on my Dash. I have a number of lists, some work related and some just personal. I originally set it up to sync all lists (as it is by default) and it seemed to do fine. I later chose a subset of lists to sync (just personal ones) and the next time it synched all tasks in those lists which were selected to synch were duplicated on my Dash and then were pushed to Exchange (synched via ActiveSync over the air). I would've expected it to see each item and realize that it didn't need to synch it - not duplicate it. It was like it did a a complete push from RTM because it detected that the configuration changed from all lists to selected lists.