I just bought a new Samsung SCH-i760 Smartphone. It came with ActiveSync 4.5 and when I install it on my WIN XP machine it never makes a connection. When I install it on my Vista machine it installs and connects fine. I have removed everything from the start up using msconfig. I have installed it from the disk that came with it as well as downloading a copy from the MS site. I have turned off Windows firewall, even though there are exception rules in the firewall. Nothing I do seems to make a difference, the only way I can get it work is by putting it on the Vista machine. Only problem, I don't have Office on that machine and I do not intend to get a copy for that machine.