Raising Forest Functional Levels

   

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Forest functionality enables features across all the domains within your forest. Two forest functional levels are available: Windows 2000 (which supports domain controllers running Windows NT 4, Windows 2000, and Windows Server 2003) and Windows Server 2003 (which supports only domain controllers running Windows Server 2003). If you are upgrading your first Windows NT domain so that it becomes the first domain in a new Windows Server 2003 forest, you can choose an additional forest functional level (Windows .NET interim).

By default, forests operate at the Windows 2000 functional level. You can raise the forest functional level to Windows Server 2003. Once the forest functional level has been raised, domain controllers running earlier operating systems cannot be introduced into the forest.

Table 16-2 describes the forestwide features that are enabled for the corresponding forest functional levels.

Table 16-2. Forestwide Features

Forest Feature	Windows 2000	Windows Server 2003
Global catalog replication tuning	Disabled	Enabled
Defunct schema objects	Disabled	Enabled
Forest trust	Disabled	Enabled
Linked value replication	Disabled	Enabled
Domain rename	Disabled	Enabled
Improved replication algorithms	Disabled	Enabled
Dynamic auxiliary classes	Disabled	Enabled
InetOrgPerson object class change	Disabled	Enabled

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