Worked great! It saved my emails and attachments without any problems. Was pretty fast considering I had a couple of gigs worth of emails!

http://forums.mozillazine.org/viewtopic.php?t=359598
&postdays=0&postorder=asc&postsperpage=15&start=0

At the above address, at the official Mozilla/Thunderbird Forums site, you will find a thread about this software that might be worth reading before you part with your money.