I am writing an application in Visual Basic that will call a Fortran program. Does the Enterprise or Professional Version of the Fortran Compiler offer any advantages over the standard version for this application?
No. The Professional Edition adds the following features: Array Visualizer (data visualization tool and library), IMSL (mathematics and statistics libraries) and COM Server Wizard. The Enterprise Edition is the Professional Edition plus the Enterprise Toolkit, that lets you develop UNIX Fortran applications from within the Developer Studio environment (using a compiler present on your networked UNIX system.)
If you simply want to write a Fortran DLL that is called from Visual Basic, the Standard Edition will suffice.