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OABs are the only option for Outlook clients that are disconnected from the Exchange server, but they're also queried first by connected Outlook clients as a way to help reduce the workload on Exchange servers.You can configure which address lists are included in an OAB, access to specific OABs, how frequently the OABs are generated, and where the OABs are distributed from.Clients never connect directly to this backend location.Client requests for the OAB are proxied by the Client Access (frontend) services on a Mailbox server to this backend location.
These changes were introduced in Exchange 2013: For OAB procedures, see Procedures for offline address books in Exchange Server.Autodiscover is supported by all versions of Outlook and virtually all mobile devices that are currently by Exchange.Here's a summary of the OAB distribution process: If a shadow copy of the OAB exists in an organization mailbox in the local Active Directory site (the site where the user is connecting from), then a local Mailbox server is used to download the OAB.You can create additional organization mailboxes to generate OABs.
Exchange Server contains the improvements to OAB generation that were introduced in Exchange 2013 Cumulative Update 7 (CU7): To find all organization mailboxes, and the organization mailbox that's defined for an OAB, see Use the Exchange Management Shell to find organization mailboxes.
To learn more about address lists, see Address lists in Exchange Server.