Source -Microsoft makes Web development tools available for free.
On September 24, Microsoft added another Spark program to its list: WebSite Spark. The newest Spark program is aimed at getting more Web developers to use Microsoft’s Expression and other development tools. (As Seattle Times blogger Brier Dudley noted, Microsoft hasn’t been bowled over by Expression sales/usage. So trying to seed these tools among developers makes sense for the Redmondians.)
Microsoft makes Web development tools available for free | All about Microsoft | ZDNet.com