Client no privilege

[henry120]

Hi,
My company network use NT4 as Primary Domain Controller, and have Exchange 5.5 (sp4)in another NT4 server before.

Now, I setup a new W2K Domain Controller(Clean install), use same domain name, server name and same user account.

I put Exchange 5.5 server to join back this domain, and use outlook to connect this server, it can send mail and received mail to outside, but when I use outlook express at home to connect company Exchange server, a error message occur "A required privilege is not held by the client"!

Now, what can I do ??

Anyone can help ??

Thanks