[gmsmith]

Are you trying to get them to just use the webUI? Because you do know you can have them using the iSync connector to sync their Entourage to the web UI and they can continue doing what they are doing. I should say that will handle the calendar. You can always just take the contacts and move them as vcards to Addressbook and sync them up. You can also use the built-in iSync services in Entourage to bring calendar/contact to iCal/Addressbook and then bring them up to Zimbra using the Zimbra iSync Connector