Scott,

You should create VFP6 versions of your classlibs. If you have to take classlibs/forms back to VFP3 you can COMPILE FORM them in VFP3.

>I am getting ready to upgrade an existing application from VFP 3.0b to VFP 6.0. Are there any concerns I need to be aware of before doing this? Do I need to re-build my 3.0 classes in 6.0? If not, will my 3.0 classes still be usable in my 3.0 apps?