Cancel a Meeting
The only person that can cancel a meeting is the person who sent the meeting request. When a meeting is canceled, the meeting is removed from your calendar and any attachments to the meeting invitation are deleted in Outlook.
To cancel a meeting and remove it from the calendar in the Outlook desktop app:
Go to the View Switcher and select Calendar
Find the meeting on the calendar and double-click the meeting.
In the meeting invitation, go to the Meeting tab and select Cancel Meeting. The meeting invitation changes to a meeting cancellation.
In the meeting cancellation, enter a message explaining the reason why the meeting was canceled.
Select Send Cancellation.
The meeting is removed from the calendar and the attendees receive an email message about the cancellation.