Review for Expression (Power) Message Search - NG by Manuel Eduardo Correia
Rated 5 out of 5 stars
It should be part of the Thunderbird core. I cannot live without it and it is the main reason I still use Thunderbird. It is this good!
This review is for a previous version of the add-on (3.4.5).To create your own collections, you must have a Mozilla Add-ons account.