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.

Send/Receive-> Send/Receive Groups-> Download Address Book….

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. Modify default OAB generation schedule in ExchangeĪfter a change has been made to any of the Address Book attributes, that is also included in the Offline Address Book (OAB), the following occurs:ĭefault update schedule when leaving Outlook running: 24 hours.Modify the OAB download behavior in Outlook.Modify the OAB update frequency in Outlook.The automatic sync and update schedules.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 is called the Offline Address Book and is being generated on the Exchange server.ĭue to various syncing schedules, it can take up to 24 hours before you could actually see a change in Outlook after a modification has been made in the Exchange organization or in Active Directory. When you have Cached Exchange Mode enabled, Outlook by will by default cache the main Global Address List as well.

Outlook identity regedit