I'm having trouble figuring out a way to fetch "cancelled" events on Office 365. It seems like a pretty basic thing to do, however none of my attempts at figuring out how to do so have worked.
Reading the Office 365 API documentation, I can see that the Event resource has an IsCancelled boolean attribute, which should show true if the event was cancelled/deleted.
I've tried the numerous methods of getting events through the API with no luck. It seems that once an event is cancelled, it simply is removed from the returned results.
I also see that I can use OData query parameters to try and filter the results of the event fetching response, so I even tried setting a $filter=IsCancelled eq true query parameter on the request, but all I got back was a response with an empty data array. :/
Is there something obvious I'm missing? The documentation's pretty light here.
Today, the calendar REST APIs match Outlook behavior. So https://outlook.office365.com/api/v1.0/Me/Events?$filter=isCancelled%20eq%20true only returns deleted events that appear on a user's Outlook as "Cancelled: " in the subject line. Once a user removes a cancelled meeting from their calendar, it won't be returned. For meeting series, we don't have a way to currently return only the instances that were deleted.
Returning deleted events (single meetings, series, and specific instances of a series) is on our roadmap, as multiple partners have requested it. However, I don't have a timeline to share with you at the moment.