I unfortunately updated already from iTunes 10.7 to 11.0 and also did some syncs to my iPad and therefore can not go back to 10.7 easily. Since I'm helping often other people with their Macs and their iOS devices I would need also to have iTunes 10.7 on my computer in order to see what they see (if they use iTunes 10.x). Is their any possibility to have both iTunes versions installed and running on the same Mac? I would not need more than one song in iTunes 10.7 and I certainly would never do any syncing in it. I just would like to have it running sometimes. The versions do not have to be on the same hard drives - I have plenty of hard drives connected to my computer.