I think @paulkerton summarised the whole issue. Spending a fortune in time money and effort to have a system that would likely fail like Teams and others would, with added aggro of training support, backups and syncing the content as there is no point having it if the content will be 3 months out of date when the proverbial hits the fan.With BYOD and some apps being overly OS dependent e.g showbie/Goodnotes, plus these big vendors have vested interest to scale up on demand in times like this and Covid might be that huge nudge in that direction not only in IT but how we work,play, buy, study, relate in many years to come