We have a two-way transitive forest trust. I want to be able to create an OWA site that only allows them to view our Public Folder calendar. I am having trouble allowing them to view this site without being prompted for credentials. I've even tried enabling anonymous access using an IUSR account from a domain controller in their forest (I discovered the IUSR password with a vbs script) and set the default domain to their domain. Does anyone have any suggestions to get me on the right track.
Both of our domains are 2003 native and I'm using Exchange 2003 on a member server.