Rated 5 out of 5 stars

EDIT ref. GOOGLE Calendar Invitations
System : Windows 10 64bit
TB 78.3.3 (32 bit)
TBSYNC version 2.18
Prov CalDAV / CardDav version 1.21
Provider for EAS Version 1.20

multiple GOOGLE accounts synced for addressbooks + calendar(s)

All of a sudden INVITING PEOPLE to a calendar appointment in Thunderbird now seems to work fine.
In my 1st google account i went to the calendar view, right-clicked my main calendar and checkt the assigned eMail address which i set to that of the google account.

On my 2nd google calendar with a different google account (one that i share with a friend) i was not able to set the assigned email address because i did not configure this account for email.
Still --- invitations work and they are sent SERVER SIDE (aparantly from google).

Seems that this whole imvitation thing is mainly a google ApI / server side config twiggle but i hope it will run reliably in long turn.
so just for info ... though i did not change anything, invitations now work :-)
greetings from Vienna, from Roland Schweiger :)

This review is for a previous version of the add-on (2.18).  This user has a previous review of this add-on.