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I have to quote Using the Intelligence Locked away in Email:
For most organizations, the largest single source of information about what’s going on in their business is the collection of user mailboxes and email archives...This rich source of content can provide valuable business intelligence to decision makers, but few extract even a fraction of the valuable content contained therein.
So if you are using our Messaging Server, for starters, you should also be using our Indexing and Search Service product. It only makes your business that more intelligent.