Migrating From Windows 2000 Domain controller to SBS 2008
We Can migrate to SBS 2008 using the same steps mentioned in my Article https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=b86e2af5-782b-4001-bf86-d872028a4619
We must verify that no trust relation exists on Windows 2000 Domain controller and there are no Windows NT domain controllers in the domain.
To achieve best results please have windows 2008 domain controller on single network card