Ask a question. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums. Sign in to vote. Wednesday, June 24, AM. Thursday, June 25, AM. Patrick Mak. You should have an entry there, open the properties for the OAB entry. If you don't have autodiscover setup right, Outlook will not be able to download the OAB. Microsoft Exchange offline address book Not downloading Offline address book files. A server URL could not be located. If I leave the window, it will be the same for a couple of hours without erroring out.
We have a casarray set up, forced the ports to and for the. An arbitration mailbox with this capability is also known as an organization mailbox. By default, OABs are generated every 8 hours. You can create additional organization mailboxes to generate OABs. You can configure multiple OABs to be generated by the same organization mailbox, but you can't configure an OAB to be generated by more than one organization mailbox. If you configured an OAB with multiple organization mailboxes, each copy of the OAB had a different unique identifier.
So, a full OAB download was required whenever a client was proxied to a different organization mailbox location. You can configure an OAB to allow a read-only copy also known as a shadow copy to be distributed to all organization mailboxes in the organization also known as shadow distribution.
All copies of the OAB have the same unique identifier, so full a OAB download isn't required when a client is proxied to a different organization mailbox location. Typically, shadow copies are only required in multi-site Exchange organizations. You configure an organization mailbox in each site, and you configure shadow distribution for an OAB to help prevent cross-site OAB download requests by clients likely over slow WAN links. To create additional organization mailboxes, see Use the Exchange Management Shell to create organization mailboxes.
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. The OAB files are generated and stored in the designated organization mailbox, so the destination for OAB download requests is the Mailbox server that holds the active copy of the organization mailbox. 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. By default, Outlook clients are configured to download the OAB every 24 hours, or users can initiate a manual download from Outlook at any time.
However, the Client Access services on any Mailbox server can proxy incoming OAB download requests to the correct location. For instructions, see Use the Exchange Management Shell to configure any virtual directory in the organization to accept download requests for the OAB. 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:. The Client Access services on the Mailbox server that accepted the connection performs these steps:. Queries Active Directory again to find the mailbox database that hosts the organization mailbox for the OAB, and the Mailbox server that currently holds the active copy of the database. 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.
However, synchronization of the shadow copy between organization mailboxes is performed on-demand. Here's how it works:. Let's say the organization mailbox doesn't have a suitable shadow copy of the OAB. This can be caused by the following conditions:. The shadow copy is out of date. Shadow copies are aware when an updated copy of the parent OAB has been generated and published manually, or by the default 8 hour OAB generation schedule.
The affected Mailbox servers will stop distributing the outdated shadow copy to clients.
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