Microsoft Silverlight is an application framework for writing and running rich Internet applications, with features and purposes similar to those of Adobe Flash. The run-time environment for Silverlight is available as a plug-in for web browsers running under Microsoft Windows and Mac OS X. While early versions of Silverlight focused on streaming media, current versions support multimedia, graphics and animation, and give developers support for CLI languages and development tools. Silverlight is also one of the two application development platforms for Windows Phone. Over the course of about 5 years Microsoft has released 5 versions: The first version was released in 2007; the latest version was released on 9 December 2011. It is compatible with multiple web browsers used on Microsoft Windows and Mac OS X operating systems. Mobile devices, starting with Windows Phone and Symbian (Series 60) phones, were expected to be supported in 2010. A free software implementation named Moonlight, developed by Novell in cooperation with Microsoft, is available to bring Silverlight versions 1 and 2 functionality to Linux, FreeBSD and other open source platforms - although some Linux distributions do not include it, citing redistribution and patent concerns