I'm unable to update any of my Outlook 2010 and 2007 clients offline address books. If I blow out their profile and re-sync they get current / new addresses, however, if a user is added they are not updated. It works just fine in non-cache mode and OWA. The 'C:\Program Files\Microsoft\Exchange Server\V14\ExchangeOAB' folder is showing not updated in a month. Any ideas?