Technical Query - Domain Access and Windows IIS7.5

I hope someone has tried this before....

I have a working Drupal installation on Windows Server 2008R2, using IIS7.5 and MySQL (and PHP of course!). I am looking at implementing the Domain Access Modules to allow a single user to sign on to more than one domain, on essentially the same site. Different themes, some content and roles between the two domains.

The installations and management of Domain Access is clearly details for Apache and Linux servers - does anyone have any tips on deploying Domain Access for Windows IIS?

Thanks in advance...