For Text
Apply width and height attributes to all block level tags like <table> and <td>, then declare a matching CSS width and height property in a style. Do not do this to % based widths.
From this
<table cellpadding="0" cellspacing="0" border="0" width="100%">
<tr>
<td width="300" height="120" align="left" valign="top">CONTENT</td>
</tr>
</table>
To this
<table cellpadding="0" cellspacing="0" border="0" width="100%">
<tr>
<td width="300" height="120" align="left" valign="top" style="width:330px; height:120px;">CONTENT</td>
</tr>
</table>
For Imagery
Replace doctype From this <html xmlns="http://www.w3.org/1999/xhtml"> To this <html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
Add this before closing </head> <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG></o:AllowPNG> <o:PixelsPerInch>96</o:PixelsPerInch> </o:OfficeDocumentSettings> </xml><![endif]-->