Awesome! Rated 4 out of 5 stars
This newest update got me to switch from Sunbird to Lightning (which I wanted to do for a while). I did not like the calendar on the bottom left taking up folder space (I have a lot of email folders). The new buttons are much better.
I do wish it was more customizable though. I would love to get rid of that small toolbar altogether and add the buttons to the main toolbar (i.e. a calendar button when looking at email and an email button when looking at calendar). Also, to have the option to loose the "today pane" would be great as well.
I for one though think this is all moving in the right direction... keep up the great work!