Login problem in Microsoft Outlook 2000

Once I launch Microsoft Outlook 2000, it will prompt me to login manually enter user name and domain name,but why user name and domain name would not display automatically like Outlook XP???I try to find the patch file for solving this problem but I can’t find it.I am using Windows 98 SE and have network with domain.server is being used is windows 2000 server
Can anyone find this solutions for me.

Thanks and regards
Wilson