It does not use domain at all; your problems can be routed back to the fact that your computer is in one DNS domain, whereas Exchange is in a different one. Outlook is remembers only the unqualified name of the exchange server, and insists on searching in your domain (where it does not find it). The solution is to add the domain of the Exchange server into the DNS search list for both OS X and Classic. (Been there, done that, can't you tell In fact, it is enough to put it only in OS X, in the Domain Names (optional) multiline text field; Classic will inherit them from there.Originally posted by dani++
Yep, I've done that already, and the name was underlined (and expanded-completed) by the server. After that, you are presented with a login panel that fails that way.
By domain does it refer to DNS name of the exchange server?