Microsoft Word 2007 provides you with a powerful digital signature function with which the recipients of your documents can sign a document using either their keyboard or a stylus connected to a tablet PC. Open the email message in Word or type it into a new document, Click within the document in the location that you want the signature to appear, Click Insert and then click the Text tab. Point the mouse cursor to Signature Line and then click Microsoft Office Signature Line when it appears then enter the appropriate information in the Suggested signer, Suggested signer's title and Suggested signer's e-mail address boxes. Enter any custom instructions for the document's signer in the box below the Instructions to signer entry. Click OK to add the signature line to the document.