Do you want to do something to the Subject line of a message you've already received, or of a message you're in the process of composing?


In either case, a macro might be overkill. For the former, pressing Shift + Tab several times will navigate to the Subject line. The number of presses will vary, but will likely be between six and eight times. For the latter, assuming you are in the middle of composing your message, press Shift + Tab once. Edit the subject, and press Tab to return to the message.