alter table [AdapterAppointments] add ReminderMinutesBeforeStart int not null default 15
alter table [Appointments] add ReminderMinutesBeforeStart int not null default 15
alter table [dbo].[ExchangeAppointments] drop column ReminderDueBy
alter table [dbo].[Appointments] drop column Reminder
alter table [dbo].[AdapterAppointments] drop column Reminder
and upgrade database using script like