WS03 Domain Functional Levels
| Domain Functionality | Enabled Features | Supported DCs in domain |
| Windows 2000 mixed |
Install from media DC Rename Universal Group caching |
Windows NT4 Windows 2000 Windows Server 2003
|
| Windows 2000 native |
All mixed mode, plus: group nesting Universal security groups SIDHistory |
Windows 2000 Windows Server 2003
|
| Windows Server 2003 Interim | Same as Windows 2000 mixed plus replication enhancements |
Windows NT4 Windows Server 2003
|
| Windows Server 2003 |
All Windows 2000 native, plus: Update logon timestamp attribute Kerberos KDC version User password on INetOrgPerson |
Windows Server 2003 |