I'm a little confused. Are you saying that you are trying to edit the form in OWA? OWA doesn't support editing InfoPath forms since it's a browser based email viewer and InfoPath doesn't work in the browser unless you have SharePoint IPFS. Editing InfoPath forms in email via Outlook 2003 doesn't work either. You'll need Outlook 2007 for that.
Maybe you mean just displaying the data (i.e. Viewing). In that case, I'd check with your browser's settings. Could be an encoding issue.