If you were using MS FrontPage to create your site and you are now moving to MS Expression Web this publication will answer questions you have regarding FrontPage Server Extension Components.
– Outlines the differences between FrontPage 2003 and Expression Web.
– Introduces the Expression Web workspace.
– Discusses Web standards.
– Provides information on how to work with your existing site, including FrontPage
Web components, themes, and shared borders, in Expression Web.
– Introduces ASP.NET support and data integration available in Expression Web.
Here is the link to the document.