Rated 4 out of 5 stars

It is the most useful add-on for Thunderbird, but version 0.5.4 doesn't deliver the same good experience as 0.5.3 in KDE. Doesn't show number of new emails and what is the worst it is impossible to open the client by double-click. I had to downgrade.

This review is for a previous version of the add-on (0.5.4.1-signed).