Use the Microsoft Exchange Server Profile Analyzer tool to collect estimated statistical information from a single mailbox store or across an Exchange Server organization. The collected data can be used for such tasks as analyzing the performance and health of a server that has mailboxes, improving capacity planning models, and improving testing methodologies and tools.
Download:
http://www.microsoft.com/downloads/details.aspx?FamilyId=8F575F60-BD80-44AA-858B-A1F721108FAD&displaylang=en