So you have to monitor this folder and see if the files get updated. 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. If one of these parameters is not ok, you most likely will have a problem with the offline address book. Most of these files should be not older than a couple of hours, and especially oab.xml should have a relatively recent timestamp should contain a bunch of lzx files and a file called oab.xml.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\ClientAccess\OAB\ Offline address book generation will not be performed. OALGen is running on a cluster continuous replication (CCR) node which does not have registry value ‘SYSTEM\CurrentControlSet\Services\MSExchangeSA\Parameters\CLUSTERNAME\EnableOabGenOnThisNode’ or it is not set to this node name. – /o=Group Messaging Organization/cn=addrlists/cn=oabs/cn=Default Offline Address List Please check the event log for more information. No offline address lists have been generated. OALGen encountered error ffffffff while initializing the offline address list generation process. When you have discovered that the Offline Address Book is not updating anymore, you may see the following event log entries in the log on your mailbox server : Furthermore, I will sometimes refer to clustered mailbox servers (CCR) and how this setup may influence the oalgen process. Of course, this is not a requirement to run a successfull Exchange installation at all, but it will help understanding the various processes. In order to fully understand the oab generation and distribution process, I will assume that you are running the Mailbox server role and HUB/CAS server roles on different servers.
Today, I’m going to share some ‘notes from the field’ about fixing oab issues in Exchange 2007
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