Changing Passwords in NT4.0

Go to start>settings>control panel and click on the password icon choose other password.
for MS Exchange thye will have to it in the client program that connects them to the server.

Well, I'm assuming you have a vanilla client-server single domain.

To change the domain network password for a user from the client, go to the control panel and select the password icon. Select "other password" then select "network password". The prompts for changing the password will appear.

As far as changing the password on MS Exchange, it should not be a seperate operation. The password change administered to the NT server should also affect MS Exchange immediately, in my experience. I am assuming you are using Exchange 5.x

Hope this helps

Todd V