The CLIENT ACCESS role checks for changes every 8 hrs. p=77 Also you can read up on how the OAB is distributed and the scheduling of that distribution here: On top of these delays, if a client does not close/open his or her Outlook, it can take even longer for a change to take place. p=312 It's the Exchange CAS not updating the Offline address book file: C:\Program Files\Microsoft\Exchange Server\V14\Client Access\OAB\Something-Something-Darkside\I just restarted the Microsoft Exchange File Distribution service on the CAS server and it updated. They are stored in the following location: which itself holds subfolders with named after Account GUIDs.
You can disable the option “Download changes since last Send/Receive” to make sure you get a complete fresh copy of the OAB but this could take longer to download.In Outlook 2010 and previous, it is recommended to leave the option “Full Details” enabled.When i look in this folder (C:\Program Files\Microsoft\Exchange Server\V14\Client Access\OAB) on the IIS server, I see a folder with date modified today, but the files in this folder have all modified date a few months ago ? Ive also found a folder (C:\Program Files\Microsoft\Exchange Server\V14\Exchange OAB) which contains more recent files but not from today when i updated the offline address book via the exchange management console What am i missing ?In Exchange 2010 it takes even longer to synchronize the changes in the OAB than Exchange 2007.The quickest and most thorough method is to simply rename the If you are still having issues with your OAB afterwards or if the files aren’t being recreated after a manual update, it is very likely that your OAB issues are rooted deeper in your mail profile.
In that case, it is recommended to recreate your mail profile.Instead of changing the default schedule, users able to force an update and redistribution of Offline Address Book (OAB) on Exchange to solve scenarios related to Outlook OAB not updating quickly.This is an amazing solution for testing or even when it is necessary that changes are done immediately.Is there any way I can force a manual update of the Offline Address Book (OAB) in Outlook or reset it completely otherwise?In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.All the email applications retain an Address Book to preserve a record of all the contacts.