I have a self managed Zimbra installation using Red Hat Ent. with about 150 user accounts.

I've experienced the same problem twice in the last 2 months: All the emails in my Inbox are lost!!!! Curiously, the email contained in the remaining folders (Sent, Trash, etc.) remains in place.

I'm using ThunderBird version (20090302) configured to use the IMAP protocol.

What should I do to:

a.- Solve the (annoying) problem?
b.- Restore my lost emails?