He seems to be using a variant of the "big lie" wrapping some pieces of truth in the bigger lie. He does appear to have a valid copyright registration for a computer program entitled "EMAIL." from 1982. He's then taking advantage of the mainstream press' unfamiliarity with copyrights vs trademarks vs patents AND their unfamiliarity with software technology--or even willingness to read something as basic as the wikipedia entry for email to realize that 1982 was late to the party and at best the guy did develop a neat computer program at a young age, but certainly is in no way is the inventor of email as a technology. Shame on the media as much as on him.
Respect your decision. That said, at the point where the only thing you need to have is an initial for last name, so "John S" or what not works for John Smith AND you can opt the profile out of search, I think it is a very small circle of people who will have issues.
It has not been my experience that the useful lifetime of a laptop is 5 years, 2-3 for a laptop that is regularly moved day-in-day out seems to be more realistic. Not saying that the machine drops dead after 36 months, just that the life cycle is usually shorter than 5, certainly for college 4 would be a better comparison, you get a computer right before you start school and keep it to the end.
Nope, once @mac.com, always @mac.com. You CAN change the email address stuff goes to.