I've been using iTunes since version 1 and have never had a duplicate file problem. I've always run it on a Mac platform and I'm currently using versions 9 and 10. Is the duplication issue something specific to Windows?
It's mandatory to have backups of your iTunes library and music files before implementing a software upgrade. If you cannot undo it, you shouldn't do it.
It's mandatory to have backups of your iTunes library and music files before implementing a software upgrade. If you cannot undo it, you shouldn't do it.