“Even if you use Thunderbird on a daily basis, you probably
don’t know it inside out. There are still quite a few ‘hidden’
features not covered in the online help that can significantly
improve your emailing habits. And since Thunderbird’s functionality
can be expanded via extensions, you can add some clever features to
it too.“Smart Folders is a nifty feature that allows you to save your
searches as a virtual folder. The idea behind smart folders is not
new: for example, many media players allow you to define dynamic
playlists based on criteria such as most played or highest rated
songs. The smart folders in Thunderbird work in the same way. You
specify a set of search criteria, then save the search and view it
as a conventional folder…”