Hello, I can't give up using iTunes 10 but need iTunes 11 to sync iOS 7 devices. I have iTunes Match. How can I use both versions on a single Mac? Also, how can I open two iTunes libraries with two separate iTunes copies? Thanks. These are the tasks for iTunes 10: - playing smart playlists using iTunes DJ* - iTunes DJ rating feature for parties - "genius recommendations" in the iTunes sidebar iTunes 11: - sync iOS 7 devices (music, podcasts) * iTunes 10 will continue playing back songs in smart (dynamic) playlists even if a condition isn't met anymore, e.g. A smart playlist "unrated songs" is playing and the current song continues to play even if a star rating will be assigned. iTunes 11 can't do that.