The easiest way to do this is to grab a mail client (outlook, outlook express, whatever) and configure it to connect to the mailbox you want to - pull it out that way. I'm sure you could probably use the Groupwise client and go right to POP3/IMAP (just be sure not to have it move the messages to the client or Unity will not have access to them any longer).
The fact that you're VM only is fine here since I'm assuming this is a "one time" thing - you wont be violating your licence agreement or anything goofy like that. Just don't install Outlook on the Unity server itself - use another client machine.
