E

Enforce Password History setting

Password policy option that dictates the number of passwords a user has to use before they can reuse the same password again.

Enterprise Admins group

Forest-level group that has the ability to control all resources within the forest.

extendable database

A database that can be modified so that additional attributes and object classes can be created.

external trusts

One-way trust relationship that is built between two Active Directory domains residing in separate forests, or an Active Directory domain and a Windows NT 4 domain that enables users to access resources within the remote domain.