> For example, I tell HTTrack to mirror www.foo.com and
> www.bar.com within a single project.  HTTrack nicely 
> <http://localhost/mirror/www.foo.com/>
> IIS barfs all over this.  It initially said, "The page 
> cannot be displayed", and "HTTP 403.1 Forbidden: Execute 
> Access Forbidden".

Try to change the "build structure", and use "Site-structure, without
www.domain.xxx/" (-N100 option)

This will prevent httrack from generating a www.foo.com directory.