Assegnate 4 su 5 stelle

It's right this add on wasn't updated, i found the solution at this page
http://kb.mozillazine.org/Thunderbird_3.0_-_New_Features_and_Changes.
You can find a link at this web page to the updated version of the add on, it worked for me !!

Questa recensione riguarda una versione precedente (0.0.5.1) del componente aggiuntivo.