I'm having issues syncing contacts between Outlook and Act! v16. Running Windows 8.1 64bit and Microsoft Office Professional Plus 2013 v15.0.4569.1506. I have automatic sync set up and everytime it attempts to sync I get the Windows error message "Act! Integration Services has stopped working". Act! continues running fine afterwards but it's causing major issues because there isn't a record being kept of correspondence between myself and customers. Any help would be much appreciated!
The following article says that it pertains to Windows 7 and Act! 2013, but the steps are still applicable for your setup, and it should be able to help you with the issue:
