The site is compatible with IE1, HTTPS would break that. Unacceptable. And I don't believe it is possible to have an HTTPS configuration that suits both old an

The site is compatible with IE1, HTTPS would break that. Unacceptable. And I don't believe it is possible to have an HTTPS configuration that suits both old and new browsers since new browsers regularly deprecate older versions of SSL/TLS. I think that anything less than TLS 1.2 is deprecated in many browsers now. and TLS 1.2 is from 2008, way too modern for a website focused on compatibility. For compatibility, HTTP is your only choice, secure protocols are likely to deprecate regularly as new vulnerabilities are found and stronger protocols are made.