Subject: transfering AD from exchange server to new windows 03 server

My network consist of a WinNT4.0 (domain controller) with a (trusted)w2k exchange server. I’ve just purchased a win2003 server and ondering which is the best way to transfer the AD from my exchange server to my new 03 server. The user/naming convention on my NT4.0 (DC) is not needed for I would like to keep the AD from my w2k exchange server. The NT4.0 server will not be used. Should I promote my W2k exchange server as a DC and add the new win2003 server as member to transfer the AD over and then demoting the exchange?
Which is the safest way? Thank you for your help!