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Office Web.UI provides visual components to help developers create nice application that will look like Microsoft Office.
By creating similar apps, you will help users getting familiar with similar UIs.

Office Web.UI suppports theming (currently only Office 2010 Silver and custom). The library works with .NET 2 and JQuery (embedded).
It’s all about CSS and Javascript. Tested with IE7, IE8, IE9, Firefox 3.6+