The 5 possible Exchange 2007 server roles are:

Unified Messaging
Edge Transport
Client Access
Mailbox
Hub Transport

For an indepth look at these roles, click one of the Exchange 2007 roles above.

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The Exchange 2007 edge transport role contains:

Anti spam protection
Anti virus protection
When used email hits the edge transport before going to the hub transport server
Can not exist on a server with any other server role.  (IE: a Hub Transport and Edge Transport server can not exist on the same physical machine)
Installed on the edge of your [...]

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