Chat Service is a self-contained component of Exchange 2000, and
requires the following software:
Windows 2000 Server. The server must be
configured either as a member server of a domain or as a domain
controller.
Microsoft Exchange 2000 Server. This software
must be installed on a server in the same domain as the Chat
Service installation. It does not need to be installed on the
particular server on which Chat Service is installed. When you run
Exchange Server setup, in Component Selection, select
Microsoft Exchange, Microsoft Exchange System Management
Tools, and Microsoft Exchange Chat Services .
System Manager. You must install System
Manager on your administrative computers.