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By default, this organization mailbox is responsible for generating all OABs (the first OAB named Default Offline Address Book, and any new OABs that you create).
You can create additional organization mailboxes to generate OABs.
OAB distribution to clients depends on Internet Information Services (IIS) virtual directories and the Autodiscover service.
The IIS virtual directory that's used for client access to OABs is located in the default web site in the Client Access (frontend) services on the Mailbox server, and is named OAB (Default Web Site).
Here's how it works: In Exchange 2010, moving OAB generation to another server required you to specify a different generation server in the properties of the OAB.
But in Exchange 2013 and Exchange 2016, OAB generation occurs in a designed organization mailbox, not on a designated 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.
Therefore, we recommend that you configure all OAB virtual directories to accept requests to download the OAB.
For instructions, see Use the Exchange Management Shell to configure any virtual directory in the organization to accept download requests for the OAB.
To manually update an OAB, see Use the Exchange Management Shell to update offline address books.
The arbitration mailbox named is the first organization mailbox in your organization.