I have an HP Ipac smartphone. I know that Vista doesn't use Active Sync, but
uses Mobile Device Center. The instruction on their site can be found here
http://www.microsoft.com/windowsmobile/activesync/default.mspx
The first time I installed Vista, I went back to XP because I couldn't get
my phone to sync up with MDC even though the iPac is listed as a Vista
compatible device, but this time around SP1 was available so I installed that
and all associated updates, followed the directions at the link above and
everything is working great. I hope this helps