Linkstation Pro LS-XH1.0TL and Windows 2003 Server

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I am trying to set the Linkstation Pro LS-XH1.0TL for use with a  Win2K3 server but am having a problem as the manual indicates Depending on your network type, you may
choose to authenticate in Workgroup or NT Domain mode. I do not see this option. Is there a firmware update for this option or is there another way to add the domain users. As I wanted to have folders on the Linkstation Pro LS-XH1.0TL which only certain users would have full access and no access to other users.