Why do you need them? I work for a webhosting company with no microsoft servers. And 90% of customers claiming they need IIS for FP extenstions are using it for either a form or a counter.
Counters are lame and forms can be handled just as well via formail.pl
oh alright, counters can be handled by counter.pl or any of the million or so versions available in google (yes thats right, not the internet, google
If you need more than that, you probably are using asp. In which case All I can suggest is learn php or better yet, python