Just deauthorised 3 computers 2 dead ones and my husbands, who lets me use it. Then read at the end, can only deauthorise when you have used 5! But itunes says I have 0 authorised great, now having spent ages trying to authorise his still cant get there, info say go to itunes store hover over the top and a menu will appear no it will not. This is the latest version of itunes downloaded today before I synced both ipads 2 and mini. Neither synced properly as not same info on both. Also ipad was next to me and computer not plugged in USB and itunes kept saying syncing.