en-US Home > Categories > Microsoft Outlook 2016 > Account Settings > Exchange > Offline Address Book Offline Address Book 4 Group Policy settings under Offline Address Book. Browse the sub-folders and settings below. Settings Offline Address Book: Limit manual OAB downloads Offline Address Book: Limit number of incremental OAB downloads Offline Address Book: Prompt before Downloading Full OAB Return e-mail alias if it exactly matches the provided e-mail address when searching OAB