If you would like to provide feedback to the Exchange product group on what should be in the next version of Exchange, check out this article at You Had Me At EHLO ... We realize we just shipped Exchange Server 2007, but we're already hard at work in
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Read the complete post at http://blogs.technet.com/jkruse/archive/2007/01/15/give-us-input-for-the-next-release-of-exchange.aspx