Hello List, We are in process of designing our OWA and RPC over HTTP deployment. We would like to use ISA server in the DMZ as reverse proxy. However, we currently have a DMZ with two third party firewalls, one external firewall and one internal firewall. We want to integrate ISA 2000 server between these two firewalls, and authenticate users to the front-end Exchange 2003 server that will be located behind the internal firewall in the corporate network. Microsoft documents indicate ISA 2000 server needs to be installed in firewall mode with two network interface cards for this scenario. This is not suiting our current network, since we want the ISA server to be located in the DMZ between the existing firewalls. I was reading an article by Tom Shinder about "ISA Server 2000 Application Layer Filtering Web Proxy in the Perimeter Network". This document is very brief, I think I need buy the Tom Shinder book for the complete document (..which I will). However, could some one please let me know, If the ISA server is located in the DMZ between the existing firewalls as an application layer filtering web proxy, can it provide the full functionality for OWA and RPC over HTTP publishing ? Thank you in advance. Regards Raj