Windows Mobile Device Center is part of Windows Vista but for some reason isn’t ActiveSync there out of the box. Not in the build I’m running anyway, which is a post RC2 build. So if you want to run Active Sync on your Vista RC2 box you have to go download it: http://www.microsoft.com/downloads/details.aspx?FamilyID=c23c8e6a-a72d-4aef-9663-31ce2fefbada&DisplayLang=en