In Pictures: 12 free Microsoft Exchange tools ever...
Jetstress 2013 and Jetstress Field Guide
Jetstress simulates disk I/O load on your Exchange server to help you verify performance (or surface any weaknesses in performance). If you have designed your Exchange storage solution to withstand the load of a specific number of users with specific profiles, Jetstress will simulate this load and report back. Note: Perform tests in a non-production environment prior to putting your system into play. It is also recommended you look through the Jetstress Field Guide, a white paper that explains the process and requirements for validating an Exchange storage solution prior to deploying to production.
In Pictures: 12 free Microsoft Exchange tools every IT admin will love