A. Unfortunately there is no supported upgrade mechanism, you have to perform a new installation and then reinstall your applications.
In practice however many people have successfully booted off the full commercial release boot disks and upgraded the install, reapplied service packs and hotfixes and not experienced any problems. The choice is yours.
If you are replacing a domain controller install a fresh copy as a backup domain controller and then upgrade to domain controller. Below are some links that may help you.
- How can I tell if my NT installation is a "Not For Resale" installation?
- How can I move shares and their contents from one machine to another?
- How can I move users from one machine to another?
- How can I copy files and keep their security and permissions?