Remote mail and netbeui

I have a 95 workstation dialing into an Exchange server5.5 using Outlook97 remote mail.I have many machines doing this and working fine. One laptop will only work if I use TCP/IP. When I attempt to use only netbeui it connects but messages are not sent or received. I don’t get any error message.Using tcp/ip is very slow and undependable.Everything seems to be setup correctly(I do this all the time). If anyone has a suggestion I wold appreciate it.
Thanx
Chris Hughes