VML based button. Rounded corners will work in Outlook.

Rounded Corners for Outlook.html

<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td>
      <div>
        <!--[if mso]>
          <v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="http://example.com" style="height:36px;v-text-anchor:middle;width:150px;" arcsize="5%" strokecolor="#EB7035" fillcolor="#EB7035">
            <w:anchorlock/>
            <center style="color:#ffffff;font-family:Helvetica, Arial,sans-serif;font-size:16px;">I am a button &rarr;</center>
          </v:roundrect>
        <![endif]-->
        <a href="http://example.com" style="background-color:#EB7035;border:1px solid #EB7035;border-radius:3px;color:#ffffff;display:inline-block;font-family:sans-serif;font-size:16px;line-height:44px;text-align:center;text-decoration:none;width:150px;-webkit-text-size-adjust:none;mso-hide:all;">I am a button &rarr;</a>
      </div>
    </td>
  </tr>
</table>

Thank you! After 5 years later... 👍

Thank you! After 5 years later... 👍

Did this work for outlook 2007? and how is it working while the tag is still there below the vml code?

Any chance you guys know how to make a round callout without a link?

Thank you! After 5 years later... 👍

Did this work for outlook 2007? and how is it working while the tag is still there below the vml code?

I was on Outlook 2013. Not sure if it works on 2007.

Any chance you guys know how to make a round callout without a link?

Try to replace <a by <span and the by

Hoy en dia no funciona, no salen los bordes redondeados

There is this site which seems to be a good alternative to make templating email
https://mjml.io/

Thanks, it's work for me.

Need fixed width:150px;
Bad solution....