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Could you let me know which factors should be considered for users, groups and computers before they are migrated from Windows NT to Windows Server 2003 Active Directory? What is Microsoft's recommended way of doing such a migration?
You will find detailed documentation and instructions for performing an NT4 to 2003 migration
from Microsoft. To perform the migration, you can use the free Active Directory Migration Tool (available on the same page), or you can invest in a third-party migration tool from the likes of Quest or NetPro.