I have a prf file to outlook clients. For the moment the new exchange will be in another domain, that will change in the future. But the usernames on both domains are the same.

I see that the example prf just takes the username

;***************************************************************
; Section 4 - Default values for each service.
;***************************************************************

[ServiceEGS]
MailboxName=%UserName%
HomeServer=exchange_server_name

[Service1]
OverwriteExistingService=No
UniqueService=Yes
MailboxName=%UserName%
HomeServer=exchange_server_name
AccountName=Microsoft Exchange Server

Can I add the domainname to that like so.

MailboxName=\\domain\%UserName´%

or is there a better way of doing this.