SQL Server Compact 3.5 is a small footprint in-process database engine for Windows Desktops and Mobile Devices.
SQL Server Compact 3.5 and Synchronization Services for ADO.Net v1.0 for Windows Desktop This download contains the files for SQL Server Compact 3.5 and Synchronization Services for ADO.Net v1.0 for Windows Desktop platform.
SQL Server Compact 3.5 Books Online and Samples This download contains the Books Online and Samples for SQL Server Compact 3.5.
SQL Server Compact 3.5 for Windows Mobile This download contains the CAB files and DLL’s that are used to install SQL Server Compact 3.5 on the Windows Mobile Devices platform.