Clarifying Sync Framework and SQL Server Compact Compatibility
Sync Framework and SQL Server Compact install with several versions of Visual Studio and SQL Server, and each version of Sync Framework is compatible with different versions of SQL Server Compact. This can be pretty confusing!
This article on TechNet Wiki clarifies which versions of Sync Framework are installed with Visual Studio and SQL Server, lays out a matrix that shows which versions of SQL Server Compact are compatible with each version of Sync Framework, and walks you through the process of upgrading a SQL Server Compact 3.5 SP1 database to SQL Server Compact 3.5 SP2.