Rated 5 out of 5 stars
A note for those who have problems with the tasks disappearing: I had the same problem, but found out that, if you close the tasks sub-window before closing the calendar tab, the next time you open the tab, the tasks will be closed, but when you open the window, the taks won´t disappear! So, you just need to close it before closing the tab! Don´t know why it works...rs
I´m a user of Google Calendar, and have been looking for quite a good time for the best way to use it with a email client, without the need to open browser or apps. I like Thunderbird and now with this extension it is simply very good.