I am often asked by our Outook users why does Outlook give us this option
when canceling meetings. I haven't found a way to turn it off and force users
always to send a cancellation and updates...so why do we give them the option
in Outlook?

At our Helpdesk we recommend our users to always send a cancellation notice,
because if you do not, the meeting attendees will not know the meeting has
been cancelled and it will still appear on their calendars and leave an
orphaned meeting. This also happens to the resource calendar as well.

There must be a reason Microsoft includes this option but what would be a
case that you would not send cancellations or updates when scheduling
meetings.

Can anyone think of a situation you wouldn't want to send a cancelation ?