Hello AllanD.

The most important rule is backup everything first. Even if you are an expert backup is an essential task.

Once everything is backup on w2k - Install Active Directory Migration Tool This is an automated tool for the job:
Active Directory Migration Tool v.2.0
http://www.microsoft.com/downloads/d...DisplayLang=en

Also you can try out Active Directory Migration Tool v.3.0 available on same site.

Read the How to use Active Directory Migration Tool version 2 to migrate from Windows 2000 to Windows Server 2003
http://support.microsoft.com/kb/326480/en-us

I have done this couple of times and Microsoft documentation is the best one.

Good luck