Microsoft SQL Server 2008
SP3
Express Edition
SQL Server 2008 SP3 Express is a free edition of SQL Server that is ideal for learning and building desktop and small server applications, and for redistribution by ISVs. Microsoft SQL Server 2008 Express is a powerful and reliable data management system that delivers a rich set of features, data protection, and performance for embedded application clients, light Web applications, and local data stores. Designed for easy deployment and rapid prototyping, SQL Server 2008 Express is available at no cost, and you are free to redistribute it with applications. It is designed to integrate seamlessly with your other server infrastructure investments.
Download SQL Server 2008
SP3
Express Edition From Microsoft Website
Microsoft SQL Server 2012
SP1
Express Edition
The Microsoft® SQL Server® Express is a powerful and reliable free data management system that delivers a rich and reliable data store for lightweight Web Sites and desktop applications. Designed for easy deployment and rapid prototyping, this download includes support for Sysprep, Microsoft's System Preparation Utility for Microsoft Windows operating system deployment.
Download SQL Server 2012 SP1 Express Edition From Microsoft Website