Rated 5 out of 5 stars

Nostalgy++ was already very good (and luckily a good alternative to Nostalgy) but Search is also a very nice feature.
What I think is the worst thing in Thunderbird is the Search function. Nostalgy++ search is better but still far from perfect. I would like it to be just like MailStore. I use MailStore find messages. I think there should be an option "Search All" and I think it's better not to constantly update the database but to do it just like MailStore. Click to update the indexed database. Takes a few minutes but you only use it if you also want to search for something received/sent not long ago, if not you use the old database.
Ps: Why not make it a separate extension?

This review is for a previous version of the add-on (3.4.2).