I have a client with a large medical office that is having trouble with their calendar appointments. All of their medical providers use Outlook Calendars for appointment scheduling and most of the staff has Editor access to modify each of the medical providers' calendars. They've noticed since their upgrade from Exchange 2013 to 2016 that appointments seem to be disappearing on the shared calendars. This is how their environment has always been configured, minus the recent upgrade from 2013 to 2016.
Any ideas as to what might be going on?