Jim has produced a list of ?stuff? to monitor on your Exchange 2003 server. Check it out: http://mostlyexchange.blogspot.com/2006/08/exchange-monitoring-hit-list.html
Check this out too, for the list of things MOM will monitor!
http://www.microsoft.com/downloads/details.aspx?familyid=2215eeab-41d7-423d-9f54-01f0df4647e9&displaylang=en
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