Changes to the Address Book can take up to 48 hours to be reflected in all clients in cached mode. Nothing you can do about that.
This is because the OAB is only generated once every 24 hours by default, which can be changed or forced to run.
However the OAB files are only downloaded to the Outlook client automatically once every 24 hours or when Outlook is restarted, which you cannot change. You can also force a download.
Therefore it isn't a bug, it isn't something you have done wrong, it is by design.
Simon.
Simon Butler, Exchange MVP
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