MarsSeed [1] filed a deletion request for thunderbird-exchangecalendar [2]:
Orphaned package. Project is discontinued after 2019. Last "stable" release is from 2018 and works only with Thunderbird v59 and lower. As there is no such version in Arch and AUR repos, I recommend deleting this. There still is an (orphan) thunderbird-exchangecalendar-beta package on AUR, working with AUR/thunderbird-60-bin package. So it is no loss if this one is deleted. (And anyway, there is a more current addon, AUR/thunderbird-tbsync, whose project is still alive and supports Exchange ActiveSync.) [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/thunderbird-exchangecalendar/
