How to: Make a task private.
Solution:
Select the task to edit. Select the 'Edit' menu and select 'Edit Item...'. Select the 'Private' check box.
1) Select the task to edit from the 'To Do List'.
2) Select the 'Edit' menu and select 'Edit Item...'. (The Task dialog box appears.)
3) Click the 'General' tab.
4) Select the 'Private' check box.
5) Click 'OK'. (A key icon appears next to the task in the To Do List.)