Okay, I need the assistance of you geniuses. I have a library on iTunes on a Windows PC laptop. I transfer a lot of that music to my iPhone in playlist format. I want to keep the iTunes library on the Windows PC laptop, but I also want that library on the iTunes on my new MacBook (which I just got today for Christmas ) Can I sync my music filled iPhone to the iTunes on the MacBook as a way of filling up the MacBook iTunes library? Follow up question: Does syncing my iPhone to the new MacBook's iTunes de-authorize me from syncing to the PC iTunes? Can I, over the course of a few syncs (due to capacity limitations), duplicate the entire iTunes library on the PC with the iTunes library on the MacBook? Thanks!