I'm trying to connect my private Zimbra server to the Exchange server at work. Authentication succeeds, and that's all well, I can see the subfolders of my IMAP account, but not the root. I understand the commercial Zimbra has a separate "Exchange IMAP" thing, but then, since this is a private server, I can't afford the commercial version.
So far as I can see, the only difference between Exchange and most other IMAP servers, is the mailbox prefix. How can I change this in Zimbra?