I found this in about:config `calendar.google.enableEmailInvitations`, you can set it to true. Then restart Thunderbird then you will be able to select an email for each primary calendar !
See https://infraadvisory.wordpress.com/2015/12/01/make-google-calendar-default-in-thunderbird/
I found this in about:config `calendar. google. enableEmailInvi tations` , you can set it to true. Then restart Thunderbird then you will be able to select an email for each primary calendar !
See https:/ /infraadvisory. wordpress. com/2015/ 12/01/make- google- calendar- default- in-thunderbird/