I have been spending a fair amount of time in the newsgroups lately, and I have seen a lot of posts around new objects not showing in the Offline Address List when clients are running in Outlook cached mode. This is very important because in medium to large sized environments there is a good chance that when you update the Offline Address List, the OAB Generation server will be reading the Global Address List objects from a domain controller that has not received the new objects that were created.1.
This is a fairly easy process to troubleshoot if you know where to look and what to look for. Microsoft Outlook 20 clients are configured for cached mode by default. An Outlook client will download the Offline Address Book assigned to the user when it synchronizes with the user’s mailbox for the first time.
In that case the whole OAB is being downloaded again.
After completing this tutorial you will have configured Microsoft Outlook to always reference the latest version of the global address book directly from the email server rather than referencing a downloaded local copy. After following these steps, you will only be able to access the global address book while Outlook is connected to the server.
And since this website’s main focus is on Outlook, it makes sense to start with Outlook as well ;-).
Before editing the registry, back up any valuable data.1. In the Edit DWORD Value dialog box, enter one of the following in the Value box: You can use this procedure to download the Full Details option for the offline address book.On the Outlook client computer, open a registry editor, such as or Regedt322. Providing that replication has taken affect successfully and the Offline Address List in question has been rebuilt, you should see your new changes in your cache mode copy of the Offline Address List Once you have verified what domain controller you are connected to with your Active Directory Users and Computers MMC, you want to load up LDP.Navigate to: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office.0\Outlook\Cached Mode3. In the left pane, right-click the Cached Mode subkey, point to New, and then click DWORD Value. LDP is used to view objects in the Active Directory.In this guide, the relevant timings are explained and instructions are given in how you can directly force an update and resync, which can be very handy when troubleshooting or when you work in an Exchange environment which sees a lot of user mailbox mutations.This means that in the worst possible scenario, an update to the Address Book won’t become available to the user until 48 hours after the change.