Exchange, ISA 2004, RPC over HTTP

[vidro]

OutLook 2003, Exchange 2003, ISA 2004 trying to get RPC over HTTP

I have a "Front end /Back end" configuration working behind ISA2004.
I've used "RPCDiag" to verify my client is connecting HTTP.
Scenario making request in to my network from the Internet
I have done the test HTTPS:// X.X.X.X/RPC/RPCPROXY.DLL I get the blank page
like I'm suppose to.

I am using ISA to pass to "RPC proxy" (front end server) none of these
servers are hanging off the internet and they all have private IP address,
192.168.0.x.
When I try to use the Outlook client with "RPC over HTTP" I am not able to
get to my internal Exchange server and when using the utility RPCDiag I am
showing connection attempts with TCP/IP and not HTTP

I probably have not passed on all the info required to make a knowledgeable
guess here, but this is a start.

Now for my question on how the client should be configured;

In the "Use Exchange Proxy" settings in the Outlook 2003 what server do I
point this too?
Is this the Published Public IP address or is this the IP address to the
RPCpoxy of the internal IP address server that the ISA server will pass to?

Is my Exchange server also needing to be published to the Internet through
the ISA server?
Than what the values I should config my clients to?
My exchange server pointing to ISA published site?
My Excahnge RPCProxy also pointing to a ISA published site?

I'M SO CONFUSED