Email Agony (almost) Alleviated with PortableApps Thunderbird!:]

Email archiving has always been a major hassle, and recently there have been some high profile examples of why you shouldn't leave your email on the office computer.

On the home front, I was very pleased to finally get several years worth of old business email off my aging desktop, in the easiest way imaginable.

Thunderbird, on a USB stick, can import email from Outlook/Outlook Express. The email is still organized, findable & readable, in its original folders; and usable on any future computer that has a legacy USB port. It'll be easy enough to toss an annual email flashdrive into a fire safe or some such!:]

However... a couple Qs arise:
a. Thunderbird will not import from itself- from an installed version to the flashdrive version. (IE will not export to much of anything...) These are settings types in a Browse window.
Is there a way to adapt/update these settings?

b. Mozillazine & SourceForge both discuss MozBackup, which would take email archiving to a CD or other 'standard' archive.

I wanted to ask people's opinion about it, because it is of non-US origin, and Windows complains about its unsigned installer. I don't find any negs on Google, but it seems like a bad spot to have a back door...

couple links:
http://kb.mozillazine.org/MozBackup
http://mozbackup.jasnapaka.com/
http://fileforum.betanews.com/detail/MozBackup_Mozilla_Backup/1066312445/1