Domain Functional Level
- Windows 2000 mixed (Default)
- Windows 2000 native
- Windows Server 2003 interim
- Windows Server 2003
Windows 2000 mixed:
- Supported domain controllers: Microsoft Windows NT 4.0, Windows 2000, Windows Server 2003
- Activated features: local and global groups, global catalog support
Windows 2000 native:
- Supported domain controllers: Windows 2000, Windows Server 2003
- Activated features: group nesting, universal groups, SidHistory, converting groups between security groups and distribution groups, you can raise domain levels by increasing the forest level settings
Windows Server 2003 interim:
- Supported domain controllers: Windows NT 4.0, Windows Server 2003
- Supported features: There are no domain-wide features activated at this level. All domains in a forest are automatically raised to this level when the forest level increases to interim. This mode is only used when you upgrade domain controllers in Windows NT 4.0 domains to Windows Server 2003 domain controllers.
Windows Server 2003:
- Supported domain controllers: Windows Server 2003
- Supported features: domain controller rename, logon timestamp attribute updated and replicated. User password support on the InetOrgPerson objectClass. Constrained delegation, you can redirect the Users and Computers containers.