My issues are pretty simple, but I can't seem to find the proper solution here. We've moved most everyone to Zimbra and there are a few people who had regular POP accounts on an old postfix server NOT running IMAP using MailDir format.

Is it possible to maybe tar up that users MailDir directory , move it to the Zimbra server and then import all host mails somehow to their Zimbra account?

Same question as above but importing from a VERY old mbox format where all the mail was in one big file. We have 2 people with that.

Everything I see here is related to migrating IMAP accounts, thus I post the question.