Hi, BT.Internet and Yahoo are seemingly 'joined-at-the-hip' ..... I have a BT.Internet address which I never use, though BT do send me emails using that address, these mails always come via Yahoo, which I never normally use. For normal everyday use I have a hotmail-plus address and Incredimail. I never use OE. My OS is XP!
Perhaps a work-around of sorts would be to get your friend to become a registered PCA Forum member, you could then email her via her Yellow envelope??