Dsclient and Outlook 2000

I am still running some Windows 98 clients on my ADS network. I have DSClient loaded on to the them but to allow my users to use outlook I need to have it set to NT Authentication. I typically set it to none to force them to login with a username and password. This was if they walk away from their desk someone can not just hop on and send at will. It worked fine prior to the implementation of the DSClient.

Help?