I've set up a single website in IIS (version 7.5). Each folder on root level (wwwroot/folder1/, wwwroot/folder2 etc.) represents a customer website.
Some of these folders need to be secured.
Each customer has it's own dns name, so customer1 goes to https://site1.domain/folder1/ and customer2 goes to https://site2.domain.nl/folder2/. In IIS I'm using a wild card certificate, all subdomains in *.domain.nl wil work.
I've created the following configuration in Shibboleth2.xml: