I have one PC installed iTune with my personal iTune account. I also have Macbook installed iTune with company iTune account. Is it posible to use both? My iPad now is with my personal account, if I connect it to my Macbook, what will happen? I am not worried about content sharing, as long as both accounts has backup, I can live with complete content gets replaced when I use different account, but I am a bit worried about registration of the device, not sure how Apple backend deal with it when I switch back and forth frequently, would be a problem? Thank you.