|Data type||Range||Default value|
|REG_DWORD||0 | 1||0|
Determines whether backup domain controllers running Windows NT 4.0 and earlier can replicate from this primary domain controller even when the primary domain controller is not configured to be in mixed mode.
This entry is used only when it appears in the registry of a primary domain controller running Windows 2000.
|0||When the PDC is configured to be in non-mixed mode, only BDCs running Windows 2000 can replicate from it.|
|1||BDCs running Windows NT 4.0 and earlier can replicate from this PDC, even when it is not configured to be in mixed mode.|
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.