Rated 5 out of 5 stars

Από τον/την Zargron στις Μάρτιος 9, 2010 · μόνιμος σύνδεσμος

Appeared to do exactly what i wanted in version 3.0.3
Created an "Archive" folder and imported last 6 years email from another program. Great having archive located away from core (current) data area.

Would be nice to see addons page updated:
https://addons.mozilla.org/en-US/thunderbird/addon/258