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Easy to get. Free to use.
    * Available free for both development and deployment.
    * Quickly build and deploy your database solution.
    * Backup and restore with ease.
    * Available with a graphical management tool, reporting capabilities, full-text search, and spatial support.
    * Ideal for building Web sites and apps, small scale LOB solutions or for redistribution with ISV applications.

SQL Server Express is easy to get and free to use Powerful
    * 10 GB database storage.
    * The same advanced database engine as other versions of SQL Server.
    * Compatible with all editions of SQL Server® 2008: Scales with your growing business needs.
    * Compatible with the scalable, self-managed and multi-tenant cloud SQL Azure Database service.

SQL Server Express is Powerful Integrated
    * Download the SQL Server Driver for PHP or check out the Community Preview version 2.0 which supports PHP Data Objects (PDO).
    * Designed to work with Visual Studio and ASP.NET.
    * Download the free PowerPivot for Excel and create amazing analysis and reports in Excel 2010.
    * Synchronize with other SQL Server Databases using the Microsoft® Sync Framework.