Exchange Server and Outlook seem to be the industry benchmark because of their widespread deployment. They offer a proprietary server providing email, contacts, scheduling, public folders, task lists, journaling, and notes using Microsoft Outlook as the client and MAPI as the API. If you consider what Microsoft Exchange offers as the "full" set of features, no other replacement offers 100% of the features exactly as provided by Microsoft Exchange Servereven those considered "drop-in" replacements. The home page for the Microsoft Exchange server is http://www.microsoft.com/exchange/.
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