It has been awhile (thankfully) since I have worked with Windows clients, but as I recall, Windows always defaults to "Guest" unless the username the server wants is also the username of the person currently logged into the local computer. You can put in a different username, but to do that you need to select the option from the "Map Network Drive" dialog. Or at least, that is the only place I know for a fact you can do it.
You could force a particular username to be used from the server side, but that doesn't sound like what you want to do.
As for using usernames from a domain, in theory that sounds like it would probably work better than the default authentication scheme, but I have never attempted such a setup myself.
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