>We have quite a large installed base of our program. All users are currently in VFP5.0.
>Are there any gotcha's in moving our program to 6.0. Do we have to send the VS Service pack 3 files also?

Compile a copy of your system in VFP6SP3 and test to ensure you don't get any C5 errors. Other than that it should be a breeze.

Make a setup routine and install on all client machines. This will ensure all clients have SP3