We have three sites with an exchange 2003 server on each site. there is one site with no direct connection to the internet. Each site has an Exchange 2003 box and 2003 or 2008 domain controller. We want to implement RPC over HTTP and being that we have no front end/back end configuration was looking at RPC over HTTP for the sales guys email. How do I set this up for remote mail folks and thru ISA server or PFSense? Im still doing alot of reading.