ESE (Extensible Storage Engine) (fka JET)

Formerly known as Joint Engine Technologies (JET), the ESE is a method that defines a very low-level Application Programming Interface (API) to the underlying database structures in Exchange Server. Other databases, such as the Active Directory database (Ntds.dit), also use ESE. Exchange 2000 uses ESE98, whereas Exchange 5.5 and Active Directory use the older ESE97 interface. [Exchange 2000]

Formerly known as JET, Extensible Storage Engine is a method that defines a low-level application programming interface (API) to the underlying database structures in Exchange. Extensible Storage Engine is also used by other databases, such as the Active Directory database. [Exchange 2003]

A method that defines a low-level API to the underlying database structures in Exchange Server. Extensible Storage Engine is also used by other databases, such as the Active Directory directory service database. Formerly known as JET. [Exchange 2007]