if the zimbra service is not running, is there an easy way to extract the messages for a particular user?

The reason I asked is that I recently needed to remove files from an old backup of a zimbra server (not backed up using the zimbra tools), and I would like to copy some files out. this is just from a chroot on my desktop workstation.

Is the /opt/zimbra/store just a set of maildirs? If so, how do I find out which one contains the e-mails that I want?

Thanks for any assistance you can provide.