history and sales opps no problem, contact information does not get synchronized. Synchronizing with a remote database.
Which version of ACT! and was this working before?
Try running database maintenance on both sides.
Database Rebuild and Repair Procedures
ACT! by Sage 2008 (10.0) Version 10.0.3.182, Hotfix 1
I did run all the maintenance - did not make a difference.