I'm pretty far along in that I can do the outlook /rpcdiag and get connected to my mail server via HTTPS but the directory access to my global catalog servers are still TCP/IP.
I have a primary and secondary domain controller (2003), and an exchange server 2003 which is not a catalog server. (is this a problem?)
I went through the Microsoft instructions for a single server on my exchange server, but because it is not a catalog server, it doesn't have the registry key, HKEY_LOCAL_MACHINE\SYSTEM\
I added the entries to DC01 and DC02 as specified - NSPI interface protocol sequences ncacn_http:6004
I tried installing RPC over HTTP on the domain controllers also, but didnt fix anything.
I'm testing on the local lan, and not through any firewall.