<meta http-equiv="X-UA-Compatible" content="IE=edge" />
Note: Exchange ActiveSync based accounts do not benefit from forcing the document mode because the rendering engine is not IE Mobile.
For more information see http://blog.jmwhite.co.uk/2014/08/19/email-campaigns-windows-phone-part-2-pop3-and-imap/
-courtesy of zerocents and James White