My company purchased Motorola ES/400 (WM6.5) which always asks for Connection Method (Serial/RNDIS) every Device Connects with Activesync, however only Serial method is works (RNDIS isnt working) so I need to default Serial connection instead of RNDIS. Unfortunately this device is defaulted the RNDIS connection, and my application in mobile device is customized so user cannot make the selection and should not (only IT which should set that configuration). Any idea on how to make this connection (Serial) as default? Via registry or any snippet code in.NET that works?