emlx to mbox Converter

"In Mac OS X 10.4 "Tiger", the default message format for Mail messages changed from the Apple custom mbox-package format to the new emlx format (where messages are stored in individual files for Spotlight indexing). However, if you need to recover from a hard drive crash, it's almost impossible to recover your mail messages easily since Mail won't import emlx files and you can't add them to your mailboxes any other way. This tool will convert your individual emlx mail files (found in ~/Library/Mail/) to the old mbox format, used by almost every UNIX/Linux mail client and recognized by many more."