Word Mail merge to e-mail loses format

When performing a mail-merge in Word and setting the destination of the merge as e-mail, the document is sent as plain text. That is, all formatting is lost. Is there anyway to have word send it as an HTML e-mail format. I’ve already tried:
1. Having the Word document already in HTML
2. Setting my default e-mail format to HTML

I know I can have Word add them as attachments, but I’m really looking for it to be part of the message body instead.