Figure 6-15
Part II: Working with Server Roles
186
Address Book Generation
The Offline Address Book (OAB) is generated once per day by default. If Public folder distribution is
enabled, it places a copy in a system Public folder. It uses the Public folder server that is set as the default
Public folder store for the generation server. It is up to an administrator to make sure there are replicas
on other Public folder servers. The chapter on Public folders explains how to add replicas to Public
folders.
Web - based distribution is actually done by the Client Access Server. The Exchange File Distribution
Service runs on the CAS and it is responsible for copying the updated files from the OAB file share on
the OAB generation server. By default, this polls every 8 hours from the time the service starts. This
means it can be at most 32 hours before a change is propagated throughout the system. Restarting the
Exchange File Distribution Service forces it to check if updates need to be copied.
The default location where the System Attendant service publishes the Offline Address Book files is
%installdir%\ExchangeOAB . This is configurable in Service Pack 1.
For example, if the generation process is daily at 5:00am, and a user is added after the process finishes,
say 6:00am, the next time the user will be in the Offline Address Book is 24 hours later.
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