I'm trying to target Outlook 2007+ with specific content and all other email clients with different content. In the Litmus results (https://litmus.com/pub/ba9508a) Outlook 2007 and beyond show nothing rather than the correct "Microsoft Outlook 2007+" content.

        <!--[if mso]>
          Microsoft Outlook 2007+
        <![endif]-->
        <![if !mso]>
          Yay! Modern email!
        <![endif]>

Is my conditional code wrong? Thanks!