Works but not always Rated 3 out of 5 stars

This addon works together with the addon provider for Google calendar. However today i removed both from my Thunderbird, because sometimes for no reason whatsoever appointments disappear.
They are still visible on google's calendar, and sometimes when i make a replacement appointment the missing appointment re-appears, but this is just not acceptable.
A pity, because i liked this addon.

This review is for a previous version of the add-on (1.8).