Switching server / w2k

I am switching a server from w2k (older box) to a bigger and better box(w2k new box). I want to make the new box as an addtional domain controller to the current w2k domain controller (older box)and pull the older box offline. Does this method make the data, user and security information to transfer to the new box OR do I have to use active directory connector? What is the simple way to switch server without damaging any data?

Thank you for your help.