Are you referring to this addon? https://github.com/Ericsson/exchangecalendar https://github.com/Ericsson/exchangecalendar It seems to be dead currently, seems

Are you referring to this addon? https://github.com/Ericsson/exchangecalendar https://github.com/Ericsson/exchangecalendar It seems to be dead currently, seems it stopped working in the latest Thunderbird release and the author is unresponsive.