Global address list not updating exchange 2016 cached mode
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. Browse to C:\Program Files\Microsoft\Exchange Server\V14\Client Access\OAB\ Services 8.2 Locate the Microsoft Exchange File Distribution service 8.3 Now Right Click on the service and select Restart 9. And finally click the Download Address Book to download latest copy IF OUTLOOK STILL DON’T HAVE THE UPDATED LIST, TRY THE FOLLOWING Try deleting the user’s oab files then have the user re-download the Address Book. Go to C:\Users\username\App Data\Local\Microsoft\Outlook 2.
You should also make sure that the OAB references on each site's Exchange server are correct.
Now go back to C:\Program Files\Microsoft\Exchange Server\V14\Client Access\OAB\ 10. This means that your Offline Address Book has now been updated, next we will update the clients Address Book and confirm that they have the latest one.
FORCE OUTLOOK TO UPDATE THE OFFLINE ADDRESS BOOK 1.
Note: If you're using Cached Exchange Mode, we recommend that you download the full details of the offline address book.
This reduces the number of times the Outlook window might become unresponsive and the number of unnecessary connections to the Microsoft Windows Server Active Directory.