If the site has changed, the service
updates the server object in Active Directory with the new information. This process occurs when the
service starts, and is verified every 15 minutes. The Topology service receives its information from
the Net Logon service. Because the Net Logon service polls every 5 minutes, there can be up to a
20-minute latency between the time the site membership changes and the update to the server object.
The details of configuring Active Directory integration are coming up in the section called ??? Working
with Active Directory Sites. ???
In addition to routing, Exchange uses Active Directory site membership in the following ways:
The mailbox server to determine which Hub Transport servers are located in the same site.
To prioritize the list of servers used for public folder referrals.
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The Unified Messaging server to determine which Hub Transport servers are located in the
same site.
The Client Access Server determines the site of the user ??™ s mailbox server and performs redirection
if needed.
Route Selection Process
This section examines how Exchange chooses mail routes. Because of the tight Active Directory integration
and changes in functionality for Exchange Server 2007, this results in many benefits to message routing
including the following:
Implicit Connectors: Explicitly creating connectors to route mail between Hub Transport
servers is no longer required.
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