Like many others have posted here, I'll point out again that ASP is itself not a language, but an object model provided by IIS. Apache::ASP strives to follow this object model, with the addition of some non IIS api extensions.

A carefully written ASP page using PerlScript will run on both platforms equally well, and by using modules instead of ActiveX components you can strive to develop pages that are platform independent. Point out to your boss that by doing this you have the ability in the future to switch platforms without having to worry about rewriting an entire codebase. Some minor tweaks, and away you go.

Consider also that to derive most solutions in the evil empire's language (VBScript) you have to pay for components to do simple things like sending mail (where in PerlScript you have all of CPAN). You have to resort to keyboard gymnastics to something as simple as opening a file (create a filesystem object...) or assigning a value to a hash (create a dictionary object...)