druck,
Thank you, but that's exactly what they attempted. There is an '08 on the showroom floor with SYNC, NAV, Sirius, etc in it. They downloaded the appropriate data from it to their IDS and attempted uploading that data to mine. My Edge would not accept it. However, after returning home I removed the NAV unit and replaced it with the original non NAV unit and everything resumed as it had previously. Confirming that they were, in fact, unable to overwrite the existing data.
It seems that Ford did not address the potential marketing issue of a customer wanting to upgrade. Apparently there is a marriage of the components via the software that cannot be divorced. (?)
My dealer is confident that they'll find a solution. For now, I'm waiting . . . .
Mike