While it is certainly good practice not to request a meeting when a person already has one booked on their calendar, the truth is that most people don't even look to see if the person is free or not. Outlook has the feature to return a notice of a scheduling conflict with a resource, but is there a like or similar function available for outright meeting requests with an individual? If not, can it be created with an add on? Is there one available? In essesence, I want to be able to force people to extend the common courtesy of NOT double booking on my calendar and forcing ME to reschedule the request that THEY want.