Zune is a media management software for Windows XP, But for Vista, 7, and 8 (including 8.1) that functions as a full media player application with a library, an interface to the Zune Marketplace, and as a media streaming server. The software is used to sync with all devices with Zune functionality including the Zune 4, 8, 16, 30, 80, 120, Windows Phone 7, and Microsoft Kin. Zune devices work exclusively with the Zune software and Marketplace.