Time flies, 20 is only 2005, which was full swing internet. I'd say 40, well really close to 50. I was using email in school on arpa in 78 or 79. Commercial beginnings were mid-80's I think. I worked for a defense contractor early 80's and the project managers were communicating with DoD via arpa email. Mere worker bees like me were using email, but I think all internal if I remember right, on a VAX/VMS system, and near the end of my stint there, Sun's. So long ago a bit foggy. I do recall in 92 submitting an application for a domain name for a company I joined. It was much more of a bar to jump to get a domain name back then. Basically you had to justify why and promise all sorts of things. Now you don't even give your name.