Outlook for Mac
Click below for instructions on how to make changes to meetings, including cancelling a meeting, in the Outlook 2016 for Mac desktop application.
2. This will then open up a composing window similar to the one you see when you create a new appointment/meeting. Here you can modify any details of the meeting that you wish to change, such as the date/time, location, or body of the meeting. Once you are finished modifying the meeting, click Send Update button on the left hand side of the composition window.
2. Click the Send Cancellation button to finish cancelling your meeting. This will send a cancellation message to all attendees.