Oab not updating on cas server
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Make sure the offline address book gets updated let’s say at least once per day.
If you are operating a cluster, it will be the active node.
That is, if the active Windows cluster node is also the active Exchange node.
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).