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Choose the in-place Upgrade method when looking for a speedier and more straightforward upgrade process.
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Choose the Migration with ADMT method when it is preferable to create a new domain structure and consolidate existing domains.
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Test the hardware compatibility of any server that will be directly upgraded to Windows Server 2003 against the published Hardware Compatibility List from Microsoft.
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Migrate groups before users when using the Active Directory Migration Tool. This preserves the user 's group membership.
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Use the Microsoft Compatibility Check Tool on the Windows Server 2003 CD to test application compatibility.
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Review the server event and system logs upon completing any upgrade.
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When possible, replace NT BDCs with new Windows Server 2003 DCs, as opposed to upgrading them.
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Test the ADMT migration process before performing the actual migration.