Is there a way on the admin/server side to import address books from iMail to Zimbra without having to involve the end users? I want to be able to migrate them over night and when they come in the next morning, not has changed as far as they are concerned other than the look.

I have found the txt files in iMail where the address books are and getting them to a csv file would not be an issue, I just don't want to have to log in as over 200 users and import each one separately. Thanks.