Cant connect to workgroup at work to use exchange server for outlo

Hello.
I bought a new HP pav 6000 in february and am now working with an NT 4.0
server at work abroad. I can't connect to the server to use the server email
exchange through Outlook. I can share files through the network, collect
files from other computers, and use the internet however.

I cant also send message back and forth to Xp Computers, nor can they
netsend me. I have vista home ultimate, windows firewall, net discovery on,
public sharing on, file sharing on.

Every time i logon to outlook and try to conncet o to exchange and enter my
user account on the server and password it doesnt work. I've tried with the
"servers name\user name", and still nothing

Any help would be great.