Source: http://www.microsoft.com/downloads/details.aspx?familyid=efdea5c6-6835-47cb-af4f-43f3a3e30279&displaylang=en
The Exchange Server Management Pack includes rules and scripts to track performance, availability, and reliability of Exchange components, such as Internet-related services, Extensible Storage Engine, System Attendant, Microsoft Exchange Information Store service, and SMTP.
This management pack not only validates the availability of communication services but also sends test e-mail to verify operations and measures actual delivery times.The Exchange Management Pack Configuration Wizard provides a graphical user interface to configure Exchange 2000 and Exchange 2003 Management Packs, including test mailboxes, message tracking, and monitoring services.
The Exchange Server Management Pack Guide for MOM 2005 explains how to use the Exchange Management Pack to monitor and maintain messaging resources. You can download the management pack guide from the Microsoft Web site (http://www.microsoft.com/downloads/details.aspx?FamilyId=2215EEAB-41D7-423D-9F54-01F0DF4647E9).