I have an mp4 video that I want to play in IE9 using HTML5 tag. I added the MIME type to IIS 7 so if I browse http://localhost/video.mp4
http://localhost/video.mp4
I had to install IIS Media Services 4.1 from the Windows Web App Gallery.
http://www.microsoft.com/web/gallery/install.aspx?appsxml=http://www.microsoft.com/web/webpi/3.0/MediaProductList.xml&appid=MediaServices