A great extension! Rated 4 out of 5 stars

I can understand where the other posters are comming from in wanting a little month view calendar in the corner--but that being said a full-screen calendar view is only a click away so see ahead so it's no big deal to me. I expand the task list to cover the right side portion and I think it's handy as hell having Sunbird within Thunderbird instead of a separate window/app. Two thumbs up to the Mozilla crew for this extension and the next time the upgrade calendar feature I'm sure they'll have different view options to make those who like either the previous or current versions happy.

This review is for a previous version of the add-on (0.7).