I have a iphone. I do not read books on electronic devices period. Just a preferences. For one I want my notes and highlights to exist 10 years into the future and not vanish when technology changes as what happened to the Palm Pilot and old Mac OS. I lost lots of apps, books and notes and guess what? Ever since MacOs leopard classic apps no longer run and ever since Mountain Lion PPC apps don't run. So guess what? It means I lost lots of books and notes from the Palm OS days. I'd estimate a very large number...
So, you lost Mac on your Mac?