I had every intention of detailing my troubles getting Exchange 2007 setup with Server 2008 and ISA 2006. I was so frustrated by the end of the process and so relieved when I finally got everything to work, I stopped thinking about it and forgot to post my experiences.
I wanted to log this one piece of information because it was the hardest thing to troubleshoot and I couldn't have done it without finding some needle in the haystack posts.
Problem:
Once I finally got most of the functionality working, the last piece I was stuck on was getting Outlook Anywhere to connect to the Directory services. The Mail connection would work fine, but not the Directory connections, so when would get a failure when connecting to things like Contacts, Tasks, etc.
Solution:
It turns out that it was a bug in the TCP/IP 6 drivers on Server 2008. If you disable TCP/IP 6, everything started worked perfectly. ...