how to move zimbra mail to OS X server mail

I have just purchased a mac server 10.6 and would like to migrate my zimbra imap folders for all my users to the mac. Is there an easy way to do this or do I have to go through the copy paste using thunderbird quagmire?

From serverfault gbrandt

• Is this or this what your looking for? Do you want to keep using Zimbra or change to a different mailserver?

  gbrandt : I am moving to the supplied mail tools in OS X Zimbra is too processor and memory hungry for my taste
  From RecQuery

• In the end I used Mail.app. I logged into my old imap account and exported everything.

  I then removed that account and logged into my new account, imported everything and dragged and dropped from my mac to the new imap account.

  From gbrandt