A music, video and photo organizer for Windows PCs and Xbox game consoles from Microsoft. Along the lines of Apple's iTunes software, Zune is used to synchronize media between the computer and a Windows Phone, and it is also used to update the operating system in a Windows Phone. Zune does not run on Macs. Mac users who have Windows Phones require the synchronization program that works with iTunes (see Windows Phone Connector for Mac).Zune MarketplaceZune was the funnel into Zune Marketplace, Microsoft's online music service. Zune became Xbox Music and then Groove Music, which was discontinued at the end of 2017. See Zune.