Exchange 2007 Server Roles – Exchange 2007 has expanded the concept in Exchange 2007 Server of server roles, which further extends the old 2 role front end back end topology, with a new 5 role model.
Breaking down the Exchange 2007 server roles has a lot of advantages, allowing your exchange topology to be more flexible, highly scalable, allowing better hardware utilization, this together with the advantages of 64bit allow more mailboxes to be hosted on a single server.
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