Windows Phone 7: The AnandTech Guideby Brian Klug on March 21, 2010 12:00 AM EST
Of course every WP7S device is also a Zune. Microsoft expects you to use their first-party media player for music, video, and also sync. The integration is nothing new here for users who have already tried a Zune HD - it integrates with your Zune Pass, and lets you download music over cellular data or WiFi. Of course, only the Zune player is allowed to play music in the background at launch, although it isn't farfetched to see Pandora and other streaming music venues integrate their services in time through the "music + video" hub.
More importantly, however, is that WP7S will sync through Zune software - not ActiveSync. In addition, WP7S will try and sync with a desktop running the Zune software periodically over WiFi. Microsoft cites additional research data showing that users often leave their photos on the phone and neglect to sync them back to the desktop. It hopes to mitigate that by enabling sync over WiFi and automatically backing photos and media up to the desktop.