We speculated earlier that we might be able to recover people's old emails that were stored on the Zimbra server if we could complete three steps: 1) determine if any of the 6+ million files were actually individual email messages stored in a standard format; 2) sort the emails by sender and/or receiver; and 3) deliver the emails to the sender and/or receiver.
Step one is done. We have determined that we do indeed have copies of all the emails that were stored on the server, and they are in a standard format.
The next two steps are going to be harder, but we're working on it. There is hope.