IIS Media Pack 1.0 provides media-specific extensions that make delivering media from IIS simple, and cost-effective. Building on the security, reliability and manageability of IIS 7.0, IIS Media Pack protects media assets as it increases scalability
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Read the complete post at http://blogs.technet.com/keithcombs/archive/2008/11/16/windows-server-2008-iis7-media-packs.aspx