https://www.dotnetzone.gr:443/cs/blogs/kpantos/archive/2010/11/24/debugging-web-sites-using-iis-express.aspxMicrosoft recently released a new flavor of IIS 7.x that is optimized for developer scenarios called “IIS Express” as part of WebMatrix . IIS Express combines the ease of use of the ASP.NET Web Server with the full power of IIS. Specifically: It’s lightweightelCommunityServer 2.1 SP3 (Build: 20423.1)