Background: On any Outlook client, the Offline Address Book (OAB) is used when pulling the list of Outlook Contacts in order to address a message. The offline address book is only updated once every 24 hours, however the update can be forced by (send/receive, download offline address book).  To add more to the story, the Outlook Name Cache is a function of Outlook in which the "To:" line of a new email will automatically populate as soon as the user inputs the first letter of a recipient that they Read more [...]