Clearing multiple activities
To clear multiple activities
From the navigation bar, click Task List, and then select the activities you want to clear.
or
From the Activity tab, select the activities you want to clear.
For more information on selecting multiple items, see Selecting more than one name or item.
From the shortcut menu, select Clear Multiple Activities.
In the Clear Multiple Activities dialog box, select the result option, and then click OK. For field definitions, press F1.