It's my turn to have problems accessing OWA from the internet(on my intranet, there's no problem). Here's what I did (I follow Tom Schinder turorial to publish owa) : (I've one server for ISA and one server for Exchange and IIS) 1) I created a destination set (mail) and add myserver.mydomain.com /exchweb/* .. /public/* and /exchange/* destinations I created a server publishing rule using the Secure Mail Server wizard. I create a web publishing rule (OWA access) that uses my server publishing rule (mail) as destination set. Now when I try to connect to owa (http://mail.mydomain.com/exchange/myusername) a get an error 403 from ISA. If in ISA, under the properties of Incoming Web requests, I check the 'Ask unauthenticated users for identifaction' and i try to connect, I must enter my username, password and domain. I did that (trying username and mydomain/username) but after 3 tentatives, I get an error 401 - unauthorized from ISA. I checked my external DNS and I've the mail.mydomain.com entry as MX record. Do I have to insert a new entry for owa ? Per advance, thanks a lot for your help Arnaud Forster