Unfortunately ActiveSync does not have this functionality.
However there are a few programs that will do this for you.
MightySync
RubberStampData (can't seem to find it in google)
I just recently found out that
Soti's PocketController also has sync-ing capabilites. I own the software but have yet to try out this piece out.
I'm currently using MightySync but intend to try out Soti's to see if its smoother.