OK. The previous message is meant for someone who want's to publish 2 internal web-servers trou ISA on one external public IP. Your case is something totally different! You have 2 external IP's right? (Since you talk about www.domain.com & mail.domain.com) In that case I would go straight forward. 1) Public web. Define incomming web requests on IP based in the server prop's. Then make 1 destination set 'www' -> www.domain.com/* (all requests). In web publish props make 'www-rule' -> use destination 'www' and forward to internal web-server, use only IP of ISA dealing with www.domain.com. (Here you can define which IP will be used) 2) Exchange OWA. Use the Server publishing rule (since Exchange OWA will need more than just web requests to work fine.) Check MS Technet for that. I think i've seen some articles dealing with that. The thing here is to be able to define a protocol which deals with the traffic and could be tricky to solve all possibilities... Good luck, Frederik