Rumors, opinions and even quasi scientific studies have been spreading about Zune's ability to share (or lack thereof) all songs. We will set the record straight once and for all with quotes from Zune marketing's Cesar and also a video interview with the Zune Product Manager himself about sharing limitations. Video after the jump.
First off it should be stated that all ripped or otherwise aquired 3rd party mp3 files can be shared period. However, there are limitations with files purchased from Zune Marketplace. Consider the latest statement form Microsoft's Cesar Menedez on sharing:
It's true, not every song can be sent. The idea of send is new, and its implementation is in a 1.0 stage. The team is continually working to improve the send technology and we're working with industry partners to expand the number of songs can be sent