In my exch 2003 org, I am using Basic Authentication for my users to login to OWA etc. I have a multiple domain environment so in IIS under “select Domain” I just put a \ and that will do a lookup on my multiple domains. This allows my users to login with just their username and no domain.
I want to do this same thing with Exch 2010; however, in ESM it only allows you to select one domain. Additionally, in IIS 7.5 (win2008 R2) I cant find where to set the wildcard character “\” to tell ISS to look-up against all domains.