New Version has a big bug Rated 5 out of 5 stars
This calendar is very useful because you can connect it with different google calendars and share appropriate dates with different people. But if you use a calendar, you become a bit dependent on it, don't you? So I would not recommend to jump positively on every very first Thunderbird update prompt because it happened to me twice that Lightning was not yet fit for the change, and I had no calendar for some hours in times with high rates of new appointments with clients at the phone. This time, I waited some days, but I had to find out that there is a bug with entering new net calendar dates, which has not been fixed yet. So, if you don't wait with updates, you become upset. Five stars though because if it works, it is a really fine tool.This review is for a previous version of the add-on (1.7).