For many organizations implementation of Exchange Audit Logging is necessary to ensure who, what, when and why someone was access mailbox data.  For me I found it important to be able to automate this process, so I wrote an article that explains how to do this with Exchange Management Shell.  This article can be found through the following web link:

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http://blog.enowsoftware.com/solutions-engine/bid/155923/Automating-Exchange-Mailbox-Audit-Logging-with-Exchange-2010