Do you have to know each user's password to successfully migrate from courier IMAP to zimbra? I did the migration for myself, of course I know my own UN and password though. I read that string I've been using has to be done for every user, but can be scripted. But do I need to know everyone's password? Or reset everyone's password to something I know and then have them change it next time they login?

(Yes, I looked on the Wiki and did a forum search. The results I got were from a year ago and they were not specific.)