I use squirrelmail, and squirrelmail uses php5.Somehow both of those survived the upgrade from Jessie to Stretch (at a time when I was not aware of the potential problem), and squirrelmail still works fine.
Can I expect that they will also survive the upgrade to Buster?(Yes, I know I should switch to a supported webmailsolution, but I haven't got around to doing it yet...)
-- Jesper Dybdal https://www.dybdal.dk