If you have existing NT4 or Windows 2000 DNS servers, you can upgrade them to Windows Server 2003 and preserve your existing server configuration and zone files. If you decide to upgrade, start with the primary DNS server, then upgrade the secondary servers.
Here's a quick checklist to use as a roadmap for your DNS deployment:
Lay out your DNS domain namespace so you know which zones you need. DNS names affect nearly every aspect of your system, so spend sufficient time with this step so that everyone agrees on the naming conventions.
Decide how you will integrate Windows DNS into your existing DNS infrastructure. If you use WINS, you also need to decide if you will use WINS forwarding.
Decide how you will ...