This article describes how to troubleshoot the following Offline Address Book present in the GAL, the changes will not replicate to the Offline Address Book. I might have a problem with my Offline Address Book in Outlook. For me, new colleagues are not showing up and the contact pictures aren't. When Microsoft Outlook is configured in Cached Exchange mode and you open the Address Book, the global address list (GAL) is not.
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We're using Outlook in a Cache Mode (we'd like to keep it that way) and it seems that the All Users offline address book will not update itself. Not downloading Offline address book files. A server (URL) could not be located. Solution: You need to make sure that the. One of the most commonly reported problems in Exchange environments is when external users are not able to download the Offline Address Book.
Offline address book downloads are not exposed through the Outlook object model. Q I added a new user to Active Directory, but the user does not show up in Outlook. A The offline address book is not up to date. Two events must occur before the changes show up in Outlook: The server must generate the offline address book and include the changes in the differential files. The Outlook client must download the changes from the server.
If you are sure that the first event has occurred, you can perform a manual download of the offline address book. Click OK.
If you make frequent changes to the offline address book, you may want to modify the way that Outlook computers on your network access the Address Book.
You can disable the downloading of the offline address book and force the Outlook computers to use the online Global Address List when they use Cached Exchange Mode.
For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base: How to prevent users from downloading the Offline Address Book without disabling Cached Exchange Mode As per this article, if offline address book. To use this setting, you must set the registry value, remove any. Q What is the effect of offline address book downloads on the network? Will offline address book downloads flood the network?
A When a cached mode profile is started for the first time, Outlook downloads the full offline address book from the server.
This can affect the network, especially if multiple clients are starting up at the same time. Other cases when Outlook clients require full offline address book downloads are described in question Differential downloads are not expected to cause a huge network impact if all the clients update the differential files on a daily basis. Outlook has the following safeguards that help protect the network from excessive offline address book downloads: In the default configuration, Outlook will only try one full offline address book download in a hour period.
An attempt is counted when Outlook receives a response from the server and can at least start the offline address book download. In the default configuration, Outlook does not limit the number of attempts for differential updates. If a differential update fails, Outlook will retry the update after waiting one hour. Also, Outlook will not perform any full or incremental offline address book downloads if the client is running in header-only mode.
To manually switch to header-only mode, point to Exchange Cached Mode on the File menu, and then click Download Headers. Note The header-only mode configuration will only work with Exchange Q Under what conditions will Outlook perform a full offline address book download?
A Outlook in cached mode will perform full offline address book download when the following conditions are true: There is no offline address book on the client computer. This condition may occur if Outlook has not performed an initial complete synchronization.
The total size of the differential files is greater than one-eighth the size of the full offline address book. In this case, Outlook downloads the full offline address book for better performance.
This condition may occur if there are lots of Active Directory objects that have a change to an attribute that is in the offline address book. For example, phone numbers are updated with a new area code, departments are added to all users in Active Directory, and new address types are added. To modify the one-eighth rule, follow these steps.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: How to back up and restore the registry in Windows On the Outlook client computer, click Start, click Run, type regedit, and then click OK.
This setting example 4 permits Outlook to download differential offline address book files that are up to one-fourth the size of the full offline address book.
Exit Registry Editor. The parent distinguished name table changes. When this behavior occurs, all Outlook clients will also try to perform a full download. A parent distinguished name is the part of a distinguished name also known as DN in an earlier Exchange format, not including the final relative distinguished name also known as RDN.
The parent distinguished name table is the set of all parent distinguished names that are found in Active Directory. This means that x addresses for users who were migrated from another organization will not be included. There is a differential file missing on the server. Outlook cannot update to the current version without it. This behavior may occur if one of the following conditions is true: You did not start Outlook to log on to your Exchange mailbox for more than 30 days.
The server policy permits only 30 days of differential files. There was an error on the server, and it did not generate the differential file for a day. The server was reset, or it crashed before it could post the differential files but after it was able to post the full offline address book files on the public folder.
The version on the server and the version on the client do not match. There is a more recent version of the offline address book present on the server. For example, Version 3a Unicode offline address book is now available, and you previously downloaded a Version 2 offline address book.
Applying changes to the offline address book failed. For example, differential files are corrupted on the server. Corruption may occur if the server goes down during differential file generation.
A change to the legacyDN table occurred. One or more offline address book files were not present on the client computer. For example, a user accidentally deletes one of the. A previous full download failed, and Outlook has to start from the beginning. You manually download the offline address book. Note Outlook will not perform a full download if there is a disk-space problem on the client computer.
This restriction helps safeguard the network against excessive downloads. It helps in many ways. OAB Version 4 only Supported OAB had many versions in the past, currently it supports only version 4, This version of the OAB is Unicode, and allows clients to receive differential updates, instead of always using full downloads. An arbitration mailbox with this capability is also known as an organization mailbox.
You can get the OAB Generating mailboxes using the below command,. If required we can change the schedule or manually enforce to update OAB. Will post them with images in upcoming articles. There should be only one mailbox configured for the OAB Generation. OAB Maintains the Unique identifier for the last update on the Outlook client done, based on that when it connects next time using that Unique identifier.
Suppose you have multiple Exchange data center locations and users are distributed across the locations, you can create the Shadow Copies of the OABs so that network traffic can be avoided.
The OAB files are generated and stored in the designated Arbitration 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. How OAB Distribution works? Clients are by default downloads OAB every 24 Hours once.