I’ve always relied on JetStress to gain confidence in any new Exchange infrastructure I build. It gives you good loading feedback and is great for benchmarking disk I/O and IOPS.
http://gallery.technet.microsoft.com/Jetstress-Field-Guide-1602d64c
According to the Exchange Team, the highlights are:
Updated for version 14.01.225.017 of Jetstress
Added Exchange Server 2003 instructions
Added more troubleshooting information
Added guidance for running Jetstress on a production Exchange Server
Included guidance for testing Raid Arrays
Included information and guidance on Background Database Maintenance
General corrections and clarity improvements
If you’re building or are about to build an Exchange setup, it’ worth a good read. Use it.
Luke Darby 
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