You can modify an existing email message:
-
Double-click the message to open it. (You can't edit a message in the Reading pane, so you must open the message in its own window.)
-
To edit the Subject line, simply select it or put the cursor in it, then begin typing.
-
To edit the body of the message: On the Message tab, in the Move group, select
 Actions and choose Edit Message (or, if you don't see Actions, select  and choose Edit Message).        -
Click in the body of the message where you want to edit, then begin typing.
-
When you're done editing, select File > Save.