I want some users to test our Zimbra setup before we go live. Unfortunately, the only problem is that imapsync only syncs one way (from our current mail server to our Zimbra server). If I delete a message in Zimbra, the message is not deleted from our mail server and is re-synced back to Zimbra. Also, pretty much any changes that you make over Zimbra don't sync over (sent messages, moved messages, etc.).
In short, is there a way to have imapsync do a two way sync? Kind-of like the most recent changes apply? I want users to be able to switch between servers and not get things messed up and or confused!