Im starting with zimbra, and is great. but i have a little question. A long time Ago, i has problems in an email server, because the mbox file size was very high (2GB and more). The solution was convert the mbox to maildir.

I search in the zimbra forums and google, and i cant found information about to use zimbra with maildir format. So, what mailbox format use zimbra?

If use mailbox, how can i prevent problems with bigger mailboxes?

Thanks in advance