Important Note: Microsoft SQL Server Desktop Engine (MSDE) will not be supported on the Microsoft Vista operating system. If you plan to build an application and redistribute a database with it, you should consider using SQL Server 2005 Express Edition instead. For more information, see the Running SQL Server on Windows Vista page on microsoft.com.
SQL Server 2005 Express Edition replaces Microsoft SQL Server 2000 Desktop Engine (MSDE 2000) as the free, redistributable version of SQL Server. Take advantage of a larger maximum database size and improved performance with Microsoft SQL Server 2005 Express Edition. Read more on the SQL Server 2005 Express Edition product overview page.