I read the Apple article on syncing iTunes with multiple computers in the home via Home Sharing and it worked great. Both the iMac (10.7) and Windows (7) computers now have the exact same music libraries. I know how to go into iTunes and make an MP3 of a track or album, but iTunes puts the MP3 tracks under the same album as the original AAC tracks. In Windows I can see these under 'Libraries, Music, iTunes and so forth, and then filter for extraction. Unfortunately, even when I've removed the MP3 tracks, leaving the AAC tracks, iTunes continues to think the MP3 tracks are present. I was making MP3 versions of my music to import into a Nexus 7 tablet, but I do not know how to resolve the iTunes behavior, let alone remove the MP3 tracks from W7 in such a way iTunes no longer thinks they are present. Ideas or thoughts on this one? I'm running the latest version of iTunes on both the iMac and Windows computers.