OAB generation occurs in a designated arbitration mailbox (not on a designated OAB generation server). This allows OAB generation to run or pause based on the workload of the server (workload management). All versions of Outlook that are supported by Exchange fully support OAB version 4.Ī mailbox assistant (not the Microsoft Exchange System Attendant service) is the process that's responsible for generating OABs. This version of the OAB is Unicode, and allows clients to receive differential updates, instead of always using full downloads. More control over the OAB distribution points. Support for more concurrent downloads by client computers. Only web-based distribution is supported (public folder distribution is no longer available). These changes were introduced in Exchange 2013: OABs in Exchange 2013 and later are improved over OABs in Exchange 2010. This OAB is also the default OAB, which means it's the OAB that's used by mailboxes and mailbox databases that don't have an OAB assigned to them. 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.īy default, a new installation of Exchange creates an OAB named Default Offline Address Book on the server. 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. OABs are used for address book queries by Outlook clients that are configured in cached Exchange mode. An offline address book (OAB) is a local copy of an address list collection.
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