When the value is set to 0, Outlook will use 16 to prevent a “divide by 0” error.
For instance, setting the value to 4 will trigger a full download when the incremental update is larger than one-fourth the size of the full OAB. Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Exchange ProviderĪs the value, set at which relative size a full OAB download should take place rather than an incremental update. To modify the threshold at which Outlook will download the full OAB rather than the incremental update, you can set the following Registry value
Key: HKEY_CURRENT_USER\Software\Microsoft\Office\ \Outlook\Cached ModeĪfter setting this value, delete all your currently cached Offline Address Books.Īnother way to look at the online Address Book without disabling the OAB is by opening the Address Book (CTRL+SHIFT+B) and use the Address Book dropdown list to set it to All Address Lists-> All Users or any other object type such as All Contacts, All Groups or All Rooms. To always work with the Online Address Book, even when you have Cached Exchange Mode enabled, you can set the following Registry key and value. These Registry values usually do not exist yet within your Registry so you’ll need to create them first. There are various Registry settings available to control or modify the update and download behavior of the Offline Address Book in Outlook. Modify the OAB download behavior in Outlook Include your account in the new Send/Receive group and set it to only download the OAB.
The only thing that you can control with this option is selecting which OAB to download In the rare case that multiple has been assigned to you. Even when you modify the Send/Receive Settings, enable the “Download offline address book” option and configure the Send/Receive Group to sync every hour, the OAB will not be updated more frequently. You can’t alter the automatic OAB update frequency of Outlook. Modify the OAB update frequency in Outlook Note: Restarting Outlook will also trigger an OAB update once updating the mailbox cache has completed. You can manually update your OAB rather than wait 24 hours.
In a later section, it is explained how to modify this. In that case the whole OAB is being downloaded again. Outlook will automatically download updates only unless the size of the changes is larger than 12.5% (one-eighth) of the total OAB size.
The command for the manual update procedure can be found here: So once you know that the OAB must have been updated (at maximum 8 hours after the change), you can manually update the OAB instead of waiting 24 hours for Outlook to do it automatically. And since this website’s main focus is on Outlook, it makes sense to start with Outlook as well -). Updating Outlook manuallyĮven 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. Note: It is not 32 hours since at least 2 OAB generation cycles exist between 2 Outlook automatic sync cycles.
This means that in the worst possible scenario, an update to the Address Book won’t become available to the user until 24 hours after the change.