Not sure if this will help you with a palm device but it helps with active
"I had all sorts of problems trying to figure out why my Del Axim X51V would
not sync with Vista, either in the beta or the release version. This Sync
problem was driving me nuts!
The problem for me was I decided to use the trial Windows Live One Care.
That was automatically changing the status of the Windows Firewall.
To resolve, I removed Live Care's "Automatically change Firewall protection
level..." AND I set the Windows Firewall to the Automatic (Recommended)
setting. I also clicked on the Firewall conntection tool and under "Select
the connections you want rhe Firewall Connection Tool to set up for you...:
I checked the "ActiveSync/Windows Mobile Device Center".
The device was FINALLY recognised and Windows Mobile Device Center is now
fully synced with my PDA."