Microsoft is set to release an exciting upgrade to ASP later in 2000. This is a major upgrade unlike the minor changes from ASP 2.0 to 3.0. Unlike past upgrades, however, this one will not be painless. When they designed ASP+, Microsoft had to make the hard decision occasionally to break backward compatibility in the interest of improved functionality and features. Before embarking on the inevitable—and not painless—migration to ASP+, it's best to know what compatibility issues you'll have to deal with. This article covers Compatibility Issues, API changes, Semantic Changes, VB Language Changes, and more.