I have Exchange Server behind Proxy Server 2.0 (Proxy with real IP and Exchange with fake IP), and I wish to configure Exchange 5.5 to activate OWA and my Web in another place. Can you tell me with full details the steps to install it (please step by step)?
What is a fake IP address? Do you mean Private, by chance? You need to be using real IP addresses for TCP/IP to work properly. Heck, I don't even think the OS will allow you to put in bogus values anyway.
In any event, you can find the step-by-step instructions you're looking for at MS KB article Q207655.