Wrong. A no-longer valid NDA only means that you can possibly talk about it or show it to the public. It does not remove any copyright Microsoft has on that stuff. You were never allowed to sell these betas, and as long as MS owns the copyright, you are still not allowed to do so. Why do people even think they can or try to discuss about it? There are laws, period.hence [...] selling these old beta CDs has completely nothing to do with legality
If you don't believe that, Microsoft even has a contract with eBay for example to make sure beta software from MS is pulled from eBay listings if someone tries. And you may get reported to VeRI, too.