enabling rich text boxes in excel forms

I have read this can be done with changes to the browser. Does anyone know how this is accomplished?

Hi Dave,

Thanks for the reply. In Excel 2007, MS made rich text boxes "Non-Allowed" content. Where as 2003 they could be used in forms, now you cannot. I read a thread where a person contacted MS and they gave him directions to make a change in his browser to allow rich text boxes in excel forms.

I just don't want to pay for the advice from MS Tech services.