Looks like outlook (which it is) with a small window size.<p><a href="http:&#x2F;&#x2F;i.nextmedia.com.au&#x2F;Features&#x2F;Outlook-2013-Mail-.jpg" rel="nofollow">http:&#x2F;&#x2F;i.nextmedia.com.au&#x2F;Features&#x2F;Outlook-2013-Mail-.jpg</a>