In case it's of interest to anyone - I contacted Navteq the other day as I was interested in a DVD map for France (yep, holidays are coming). They don't list Fiat Ulysse (or 807) on their site any more. Their response was:
The new version of CD for the RT3 navigation system can be ordered through your dealer as we do not have direct distribution of the products. The reason for this is that the actual navigation system will need to be updated to enable it to read the newer maps. We advise this to be done by the dealer.