Download the Community Technology Preview (CTP) of Microsoft SQL Server 2005 Express Edition. Unlike beta releases that receive a much higher level of testing and feature work, CTPs are intended to expose the latest working build to developers.
SQL Server 2005 Express Edition (SQL Server Express) is the next version of MSDE 2000. It is a free, easy-to-use, lightweight version of Microsoft SQL Server 2005. To obtain additional information about SQL Server Express, click here.
SQL Server 2005 Express Edition - Community Technology Preview February 2005 is unsupported pre-release software.
Download: SQL Server 2005 Express February CTP