Today, Sonos announced a software update for its music setups, which will allow users to listen to Microsoft DRM-encoded music. Version 2.1 includes tracks purchased from AOL Music Now, URGE, Napster, Wal-Mart, Yahoo! Music Unlimited, Zune Marketplace and adds "improved playlist and volume normalization support" for iTunes 7.0. It also brings full compatibility with Windows Vista and Windows Media Player 11. So for the small group of you out there who have all your music constrained by Microsoft DRM and wished you could buy a Sonos system, Christmas has come very early for you.