I am a little confused by KB Article 290113. My configuration is the following: I have a firewall that is NAT'ing an external ip address (63.x.x.x) to an internal IP address (192.x.x.x). The internal IP address is bound to the external NIC on ISA in my DMZ. I have followed the instructions in KB 290113. http://support.microsoft.com/default.aspx?scid=kb;[LN];290113 Where I am a little hazy is step 2c. It is asking for a "URL the External Web Clients use to address OWA". In this case, I am testing a "proof of concept" so when I do my actual cutover I can do it realitvely quickly. I don't have a URL to actually test with but there is an option to enter an IP address on the screen. Would I enter the 63.x.x.x address or the 192.x.x.x address since it is NAT'ed through a firewall? Any help is appreciated. - Matt Matthew Bailey LAN Engineer CSK Auto, Inc. Voice: 602.631.7486 Fax: 602.294.7486