Planning for the Edge Transport Role
The edge transport role is new in Exchange 2007/2010 and is a completely new concept. Edge transport servers are standalone, workgroup members that are meant to reside in the DMZ of a firewall. They do not require access to any internal resources, save for a one-way synchronization of specific configuration information from Active Directory via a process called EdgeSync.
Edge transport servers hold a small instance of AD LDS, which is used to store specific configuration information, such as the location of hub transport servers within the topology. AD LDS is a service that is often known as “Active Directory Light,” and can be thought of as a scaled-down version of a separate Active Directory forest that ...
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