Outlook 03 reply to plain text in HTML?

We have a standard signature for our firm including a graphic logo, so it is obviously in HTML format. They want it to go on replies and forwards, too, not just new messages. If a message comes in that is plain text, Outlook defaults to plain text in reply or forward, so the signature is screwed up. Is there any way to get Outlook to use HTML format for replies, regardless of the original message format? I know OE will do it, but it appears Outlook will not. Please tell me I’m just missing something! I know we can CHANGE the format to HTML, but by that point the signature is already shot because it started out in plain text. I need it to DEFAULT to HTML for everything. Is that possible?