This is called the Offline Address Book and is being generated on the Exchange server.
The problem I am having is that my Global Address List is not updating with the most current information.
So far I've concluded that this is because I am using Cache mode.
In that case the whole OAB is being downloaded again.
In a later section, it is explained how to modify this.
Please also remember to have the clients download the updated OAB to view the entries.