The following table
summarizes the changes in message routing between versions of Exchange Server.
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Chapter 11: Exchange Server 2007 Routing
299
Exchange Server 2007
Exchange 2000 Server and Exchange
Server 2003
Exchange uses Active Directory sites to determine
an intra-organizational routing topology.
All Exchange Server 2007 computers are associated
with a single routing group for the purposes
of routing to earlier versions of Exchange Server.
Exchange uses routing groups to determine
an intra-organizational routing topology.
Exchange determines the least cost route
between Hub Transport servers by using Active
Directory Service IP site link costs.
Exchange determines the least cost route
between bridgehead servers by using
Routing Group Connector costs.
Exchange uses direct relay to deliver messages
between Hub Transport servers.
Exchange relays through bridgehead
servers in each routing group in the
routing path.
When Exchange can??™t connect, it uses the least cost
routing path information to back off from the destination
until a connection can be made to a Hub
Transport server. Messages queue at the reachable
site that is closest to the destination. This behavior
is known as queue at point of failure.
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