Microsoft Office Outlook cannot sign or encrypt this message because you have no certificates which can be used to send from ...

Microsoft Office Outlook cannot sign or encrypt this message because you have no certificates which can be used to send from the e-mail address '%s'. You can do either of the following:  Get a new digital ID to use with this account. On the Tools menu, click Trust Center, click E-mail Security and then click Get a Digital ID.  Use the Accounts button to send the message using an account that you have certificates for.