Note If the Complete field appears in the task list (task list: A list of tasks that appears in the Tasks folder and in the TaskPad in Calendar.) (as a check mark in the column heading (column heading: The horizontal bar at the top of one column in a table. There are multiple column headings in the column heading row.)), you can select the check box for the task to mark it complete. Or, if the Status field appears in the task list, you can click Completed in the list.