I was able to recover some data from a Windows computer that completely crashed on me. I now have a Mac. I have downloaded all of my previous ITunes purchases, but I'm trying to reconstruct my entire library, even if I have to do it with ITunes Match. I see a folder with "previous ITunes libraries." How do I get these libraries (and hopefully my full song library integrated into current library? Also, I probably have other backed up ITunes libraries that I can recover from an online back-up. Is the procedure the same for those libraries also? Thanks!