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 The shadow copy is out of date.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 The affected Mailbox servers will stop distributing the outdated shadow copy to clients.
This will trigger a full copy of the OAB from the parent to the shadow copy. Privacy policy. An offline address book OAB in Exchange Server allows Outlook users in cached Exchange mode to access address list and global address list information while they're disconnected from the server. For more information, see Offline address books in Exchange Server. Use the Exchange Management Shell to view offline address books.
Use the Exchange Management Shell to create offline address books. Use the Exchange Management Shell to configure the default offline address book. Use the Exchange Management Shell to add and remove address lists from offline address books. Use the Exchange Management Shell to change the organization mailbox that's responsible for generating an offline address book. Use the Exchange Management Shell to configure any virtual directory in the organization to accept download requests for the OAB.
Use the Exchange Management Shell to enable shadow distribution for offline address books. Use the Exchange Management Shell to update offline address books.
Use the Exchange Management Shell to remove offline address books. Use the Exchange Management Shell to find organization mailboxes. Use the Exchange Management Shell to create organization mailboxes. Assign offline address books to mailbox databases.
Use the Exchange Management Shell to assign offline address books to mailboxes. You need to be assigned permissions before you can perform this procedure or procedures. Properly managing and troubleshooting the Offline Address Book can be quite complex.
The above examples on how to modify the generation schedule and force an update only just scratches the surface. Default generation schedule: 8 hours. Outlook downloads the OAB. Default update schedule when leaving Outlook running: 24 hours. Updating Outlook manually Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.
Select your Exchange account and enable the option: Include the selected account in this group. Prompt before for full download As the OAB can be quite large in some environments, it could be wise to be prompted when Outlook wants to download the full OAB.
Location of the cached oab-files Rather than forcing an OAB update via the Outlook interface, you can also manually delete them when Outlook is closed. Right click on the dropdown field and choose Properties. Modify default OAB generation schedule in Exchange When making a change to a mail recipient like the email address or the display name of the user or even update the parameters of an Offline Address Book on the Exchange server via Exchange Management Shell PowerShell , updating the Outlook client after that will not directly get you a fully up-to-date copy.
Create a setting override via the New-SettingOverride cmdlet. Apply the setting override via the Get-ExchangeDiagnosticInfo cmdlet. This method is still being used in Exchange and Exchange although some details have changed see further links below. Hendrik Wiese Information Security Manager. Published: Updated: Outlook Address List not showing newly created users or contacts 2.
Now click on start and type Exchange Ma 3. Now Select the Offline Address Book tab 3. You can also click on the Update link located in the Action pane on the far right after highlighting the Default Global Address List. You will receive the following message, just select Yes 5. Now we will need to verify that the update actually took place Keep in mind that you would have to give the update about 10 minutes to ensure that it has completed 6.
It will still contain an old date! To have it update do the following: 8. Verify that the Date Modified is today's date:
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