Warning: The following steps will delete all items in your calendar, including holidays that are automatically added to the calendar. You can replace default Outlook holidays that are deleted during these steps, but all other calendar items will be permanently deleted.
- In the Navigation Pane, click Calendar.
- On the View tab, in the Current View group, click Change View, and then click List.
- Click in the item list, and then press CTRL+A.All items in the list should now be selected.
- Press DELETE.