Do one of the following:
Turn Word on or off as your default e-mail editor for all new
messages
Turn Word on as your e-mail editor for one new message
On the Actions menu, point to New Mail Message Using, and then click Microsoft Word (message format).
Turn Word on for viewing all Rich Text formatted messages
You may want to set this option if you often receive the message "This message contains formatting that is best viewed with Microsoft Word. Click here to display in Word."
From the main Outlook window, click the Tools menu, click Options, and then click the Mail Format tab.
Select the Use Microsoft Word to read Rich Text e-mail messages box.
Note If Word is your e-mail editor, see Word Help for information about working with messages.