in reply to I'm not anti-Microsoft, just anti-stupid!
Yes, but you have to remember that IIS was developed with ASP in mind, not Perl. I'm not arguing IISs merits or flaws, but while Perl *does* work with IIS, it's not IISs native scripting language.
You get the same result (a web page that a user sees), but the actions that go on behind the HTTP request are completely different. As a result of this, I don't really feel that you can compare IIS/Perl to Apache/Perl.
And any time you bolt two components together that aren't designed to work with each other, you're bound to have problems. I would present a good example, but it's too early in the morning for me.