To open Today's business: From the Schedule menu, under Today's business, click Summary. Select the link that contains the activity type you want to delete (for example, Appointments).
To delete an activity
Select the activity you want to delete.
Click the Delete action menu item.
The Delete activity dialog box opens.
Click Yes to confirm deletion.
If a repeating activity is selected for deletion, the Delete repeating activity dialog box opens.
Click Delete to delete only this occurrence.
Click Delete all to delete the series of activities.