Use the drop-down menus to complete the statements about message flagging. The (Flag message, Add flag, Follow up) command is used for message flagging.
When you “flag” a message, it will display as a task with a flag icon in the (Reading pane, To-Do bar, Events list).
Flagged messages can be customized by renaming the task, adding a due date, and setting (Colors, Reminders, Sort order).
Clicking (Mark complete, Unflag message, Remove flag) will remove the flagged message/task from the To-Do list.