Problem: Your Windows Mobile Device does not connect prop. to your Vista system although you have installed the latest version of the Windows Mobile Device Center (WMDC).
Solution: Try the following on your mobile device. Start –> Settings –> Connections. Click on the “USB to PC” icon, and deselect the extended network functionalities. By changing this, e.g. a Palm Treo 750 just started to occur on the WMDC connected.