To delete an event:
1.On the Calendar tab in the Today Pane or in the Event List, select the event and press Del or select Delete Event from the event context menu.
2.If the event is a one-time event, confirm the deletion in the pop-up window.
3.If the event is recurring, the Delete Repeating Event window will appear, in it select Delete only this occurence or Delete all occurences. This repeat or all repeats will be deleted immediately.
4.If you are the author of the event and have invited other participants to the event, a dialog box will open, select whether to send a notification to the participants' addresses or not.
If you are the author of the event, the event will be removed from your calendar and the calendars of the event participants.
If you are not the author of the event, the event will be removed from your calendar only.
Also, if you are the author of the event, you can delete the event in the Event Edit Window.