Great AddOn Rated 5 out of 5 stars
Thanks A LOT for this. I was looking for that functionality for a log time.
1 more up-vote to make the first month (and maybe number of months) displayed "customizable". Consequently this would be a "multi-month" view. There the mouse wheel should then scroll through the months - i.e. 1 wheel-click => shift the months displayed by one. E.g.: display: jan2010...dec2010 => scroll forward by one "click" => display:feb2010-jan2011 - and so on.
Of course the display should update a bit faster for this - but it would be still usable right now as well. To speed it up the AddOn should be integrated into lightning core I guess, which I'd love to see of course. Then I'd definitely immediately shift from gnome evolution to thunderbird+lightning.