I have been searching throughout the net and all around here on experts exchange to find a definitive and workable solution to this Issue. Organization have been tackling this for about 12months now. We have our IIS, MOSS and SQL Server internally on our domain. ISA Server is in our dmz, sharepoint access via SSL with authentication through AD and Certificates. We have no trust between our sister organization, but require them to access our internal network with all the security measures in-place. We will be creating shadow accounts in AD for these external customers. What i'm looking for is a decisive and clear means to allow external customers on another domain to access our sharepoint portal via ISA. Any assistance and/or direction is greatly, immensely appreciated.
Bottom line: I want to be able to use ISA server while we are building up other servers and infrastructure in our Forest/Domain level for Server 2008 AD FS.