The Offline Address Book files that get downloaded by Outlook clients are stored on the CAS Server(s) in the following folder (assuming that you have performed an Exchange installation using the default folders) : C:\Program Files\Microsoft\Exchange Server\Client Access\OAB\ If one of these parameters is not ok, you most likely will have a problem with the offline address book.I’m convinced that you will be able to fix the issue, but you can only fix the issue if you know that an issue exists.But From Exchange 2010 Outlook Connects only to the Client Access Server for MAPI Connectivity.Offline Address book Generation Server will be a Mailbox Server.So you have to monitor this folder and see if the files get updated.In fact, it may be ok to just monitor the timestamp of and report back if the file gets older than one day (for example).Microsoft introduced the concept of a Web-based distribution point for OABs in Exchange 2007.
Earlier Exchange Versions Outlook Connects to the Mailbox Server for MAPI Connectivity.
But how are the OAB files distributed to the Client Access Servers (CAS)?
To distribute the OAB to the configured CAS Servers the File Distribution service is used.
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