It appears that your Outlook profile is not configured with a secure certificate that uses greater than 1024 bit encryption. ...

It appears that your Outlook profile is not configured with a secure certificate that uses greater than 1024 bit encryption.  For optimal secure email delivery leverage a certificate with at least 2048-bit encryption.  Click on the link 'get help fixing this issue' in the actions pane located on the right side of the screen for assistance.