A. Windows 2000 offers two domain modes: Mixed and Native. Windows 2003 expands on these modes so that you can access features available only in the new OS. The domain modes available in Windows 2003 are

  • Win2K Mixed--In this default mode, a domain can have Windows NT 4.0 and later domain controllers (DCs).
  • Win2K Native--In this mode, a domain can support only Win2K and later DCs. This mode provides additional functionality, including nesting groups, Universal groups, and support for SID history and group conversions. You must manually switch modes to upgrade to Win2K Native mode.
  • Windows 2003 Interim--In this mode, a domain can support only Windows 2003 and NT 4.0 DCs. This mode doesn't add any extra functionality. You set this mode when you use DCPROMO during an NT 4.0 PDC upgrade.
  • Windows 2003--In this mode, a domain can support only Windows 2003 DCs. This mode has additional functionality over Win2K Native mode, including the ability to rename DCs, add a password on InetOrgPerson objects, redirect the default Users and Computers container, and maintain a last logon timestamp attribute. You must manually switch modes to upgrade to Windows 2003 mode.