X.400 Connector

An Exchange component that is integrated with the message transfer agent (MTA) and can be configured to connect routing groups within Exchange, or to route messages to other X.400 systems. When handling communication between Exchange and other X.400 systems, it maps addresses and converts Exchange messages to native X.400 messages and vice versa. [Exchange 2003]

An Exchange component integrated with the MTA that can be configured to connect sites within Exchange, or to route messages to foreign X.400 systems. [Exchange 5.5]