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In that case, you can completely reset it by deleting the files making up the OAB or by recreating your mail profile.
For more information about permissions, delegating roles, and the rights that are required to administer Microsoft Exchange Server 2007, see Permission Considerations.
Is there any way I can force a manual update of the Offline Address Book (OAB) in Outlook or reset it completely otherwise?
In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.
An OAB is a copy of an address book that has been downloaded so that a Microsoft Outlook user can access the information it contains while disconnected from the server.
Exchange administrators can choose which address books are made available to users who work offline, and they can also configure the method by which the address books are distributed (Web-based distribution or public folder distribution).