Creating additional offline address books is a waste of time if they are not assigned to users; this will only result in everyone continuing with the default offline address book. Where desired, it is possible to assign the offline address book to clients at both the database level and on the individual mailbox level.
From the Exchange Management Console, look for the desired mailbox database under “Server Configuration.” Go into its properties and click on the “Client Settings” tab. Change the default offline address book by clicking on the “Browse…” button in order to switch to the new offline address book for the entire database. In order to configure the offline address book for individual recipients, simply use the Set-Mailbox cmdlet from the Exchange Management Shell.
In summary, there are actually two different ways to deploy a new offline address book. The first is by editing the database properties which is outlined above, while the other is by using the Exchange Management Shell and applying the Set-Mailbox cmdlet directly to all recipients.