Outlook 2013 Ignores font-family

I had this problem and found the following post that fixed the issue: https://litmus.com/community/discussions/982-outlook-overrides-font-to-times-new-roman

Basically, you need to add the following conditional css style snippet right after the body tag in the email template you want Outlook to take the desired font-family (in this case Arial, Helvetica or San-Serif) instead of the sticky MSO Times-New-Roman font:

<!--[if mso]>
<style type="text/css">
body, table, td {font-family: Arial, Helvetica, sans-serif !important;}
</style>
<![endif]-->

An effective way to force Outlook 2013 to use specified font stack is to wrap the text in question in a <span> and to use !important when defining the font-family. Outlook will still remove any Google fonts that are defined in the head, but other email clients will use them. Here is an example:

<head>
<link href='http://fonts.googleapis.com/css?family=Indie+Flower' rel='stylesheet' type='text/css'>
</head>

<body>
<table>
  <tr>
    <td style="font-family: Helvetica, Arial, sans-serif; font-size: 12px;">
      This will always be Helvetica.
    </td>
  </tr>
</table>

<table>
  <tr>
    <td style="font-family: 'Indie Flower', Helvetica, Arial, sans-serif; font-size: 12px;">
       Outlook will display Times New Roman. Others will display Helvetica or Indie Flower.
    </td>
  </tr>
</table>

<table>
  <tr>
    <td style="font-family: Helvetica, Arial, sans-serif; font-size: 12px;">
      <span style="font-family: 'Indie Flower', Helvetica, Arial, sans-serif !important;">
        Outlook will display Helvetica, others will display Indie Flower.
      </span>
    </td>
  </tr>
</table>
</body>

This came from this awesome article: https://www.emailonacid.com/blog/article/email-development/custom-font-stacks-in-outlook