Microsoft Expression Web offers a powerful array of visual tools for creating great looking sites while fully supporting Web-based standards. Expression Web makes it easy for designers to quickly design cool sites with tools that feel familiar. Thanks to Expression Web's underlying standards, the files can then be passed to developers who can code the site in the development tools they prefer. This back and forth without designers having to touch the code unless they want to makes this a powerful program. In Expression Web 2, Microsoft has added support for PHP backed sites and made it easy to work with PHP. Other new features include: Silverlight support and new editing capabilities for Flash SWF and Windows Media files. In addition Expression Web 2 now provides ASP.NET AJAX server controls that enable users to quickly create web pages that include a rich user experience with responsive and familiar user interface (UI) elements.