Will Mountain Lion erase all my photos, iTunes, and Apps?
I just bought the new 13 inch MacBook Pro. I transferred off the white macbook and that was my computer with everything on it meaning photos, iTunes, and apps. The white MacBook had my old account iTunes music and my new account iTunes music. And this was a weekend long process and I don't want to have to wait 90 days to download the music again, so when I upgrade to OS X Mountain Lion, will it erase my music, photos, home movies, and every thing that is personal, and not receivable?
MacBook Pro, Mac OS X (10.7.4)