I had mistakenly thought that Apple Mail and Entourage automatically shared the same Address Book application. But in switching from Mail (Version 4.3) to Entourage (Microsoft Entourage 2008 for Mac Version 12.2.1), they are not the same. I have tried to find a way of exporting from Mail to Entourage and from the Address Book application directly but haven't figured it out. If anyone knows a nice straightforward explanation somewhere online and can refer me to it, that would be great. Just to be clear, I did export my contacts from Address Book to a folder using both the "Export Group vCard" and "Address Book Archive" options. But when I then went into Entourage and tried all the options I could find for importing contacts, I had no success.