Silverlight is a new cross-platform media application from Microsoft. If you watched any of the 2008 summer Olympics on the NBC website you were using the NBC Silverlight player to view the video. Naxos Music Library 2.0 also offers a Silverlight player. The first time you access a track, Naxos will check to see if you have Silverlight installed. If not, it will offer you the opportunity to download and install it. We recommend that you use the Silverlight player. It has many advantages over the previous Windows Media based player, especially for Mac users (requires OSX 10.4.8 or higher, however). Even with Silverlight installed, you will always be given the option to use the older Windows Media Player.