importing from Mac
This is much easier than it seems. Simply create a new account in your Mac mail program that points to your Zimbra IMAP server.
Then simply drag your mailboxes from your local mail into the zimbra server. As long as you don't have too many toplevel email folders, this is probably the quickest/easiest way.
International Research Institute for Climate and Society
Earth Institute at Columbia University
Release 7.1.1_GA_3196.RHEL5_64_20110527001604 RHEL5_64 NETWORK edition.