Microsoft Exchange Server Jetstress 2010 Beta (64 bit)
Simulate disk I/O load on a test server running Exchange to verify the performance and stability of your disk subsystem before putting your server into a production environment.
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=13267027-8120-48ed-931b-29eb0aa52aa6

Exchange Load Generator 2010 Beta (64 bit)
Exchange Load Generator is a simulation tool to measure the impact of MAPI, OWA, ActiveSync, IMAP, POP and SMTP clients on Exchange servers
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=cf464be7-7e52-48cd-b852-ccfc915b29ef

Microsoft Exchange Server Profile Analyzer (64 bit)
Collect estimated statistical information from a single mailbox store or across an Exchange Server organization.
http://www.microsoft.com/downloads/details.aspx?familyid=C009C049-9F4C-4519-A389-69C281B2ABDA&displaylang=en