Ok, please bear with me as I try to explain what the problem is (new to macs & still stumbling and fumbling around rather ineptly). When I switched I moved all my music to the new laptop using a USB drive. I don't remember exactly how I did that apart from the fact that first I had to move the music back from an external HD to the old laptop (badly running out of space there so kept iTunes on external HD), then I copied it to the USB & then from the USB to the MBA. So amidst all that copying back & forth I must have created copies of most (all?) my music files b/c when I look in the iTunes media folder (the music folder, not the library) I see two of each m4a file there with almost same file name (one file has the number "1" at the end of the name before the extension). Apart from the fact that those files take space they're annoying the hell out of me The other problem I keep having since switching is that links get broken: there's the little exclamation mark next to a track, when I click on it it says "can't locate file" or similar; when I navigate to the music folder & open the file the link gets repaired (that's when I discovered the duplicate files). So I guess my questions are: 1) Are those really duplicate files that I created or is this something iTunes does for its own mysterious purposes? 2) Can I really delete those files without inflicting damage on the music files and is there a quick way to do it? 3) Why do links get broken? Never had this happen before... and again, is there a quick way to do it or do I have to search for and open each file manually? Oh, and I have a few other niggling issues, e.g when I switch to a list view iTunes rearranges the tracks in an album from last to first. if I switch to album view it fixes itself so I stay there but, again, it bugs me A quick aside: love my MBA and the OS but there is definitely a learning curve P.S. Just saw the sticky at the top of the forum: seems I posted in the wrong place, sorry & moderators, please feel free to move the thread to the mac app forum.