>I Was reading about the MSDE Database Engine included in VS 6, that is recomended to use it instead the Jet Engine and VFP Engine as a preparation for the migration to SQL Server without additional programming when the app is going to be used with 5 or less users. What do you think?

I agree with this. A few of the speakers at the Great Lakes Great Database Workshop said that MSDE (now called SQL Server Desktop Engine) is binary compatible with SQL Server. As I understand it, SQL Server without the Query Analyzer, Enterprise Manager, etc.