Wow..this is turning out to be a very interesting thread..thanks for all contributions.
I would add that this customer, although an existing customer, the reps app has not been signed off on yet, so to some degree, a bit theoretical. However, I do have to give the guy figures, and though the main app on the notebook wont go above 4 gigs, they do want to be able to access company wide information which easily could go over the 4 Gigs. I need to have the figures, if we start off with Sql Express, and then end up with Edhy's scenario where the database goes over 4 gigs one day....we'll all be in a dilly of a pickle then !!!!
The next day.... the company may need to fork out 15 X $1,800 = $27,000...not a pretty picture
Is there another database out there which is truly 100% comapatbale with Sql Server......if it was 100% compatable , should it not then be a matter of changing a connection string and bobs your uncle ??..The App or Sf should not even be aware of a change if it is truly 100% compaible ??