You can cancel a meeting you previously scheduled.
In Calendar, select the meeting you scheduled.
On the toolbar, click Delete .
You can also open the meeting and then click Cancel Meeting on the meeting request form toolbar.
If it's a repeating meeting, choose whether to cancel this occurrence, all occurrences after a specified date, or all occurrences of the meeting, and then click OK.
Click Send or ALT+S to send the cancellation notice to attendees.
If you want to include a message with the cancellation notice, for example, the reason you're canceling the meeting, type your message in the body of the cancellation form before you send it.
What else do I need to know?
You can't cancel a meeting you didn't create. If you've accepted an invitation to a meeting from somebody else and want to cancel, you can only remove the meeting from your calendar.
When you delete a meeting from your calendar (you can do this by deleting the meeting or by declining it), you'll be given a choice of sending a response, editing the response before you send it, or not sending a response. If you don't send a response, the meeting organizer won't know you've removed the meeting from your calendar.
What if I want to know more?