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Do I need an edge transport server with Exchange Server 2010 if I'm using a filtering service like Postini or Mimecast.
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Do I need an edge transport server with Exchange Server 2010 if I'm using a filtering service like Postini or Mimecast.

Exchange Server 2010 Edge Transport Server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.