I recently reinstalled Windows and went to load a project within Visual Studio and got the (YSOD as seen below) error that the database could not be opened because it is version 661 And that the server supports version 655 and earlier.
Basically the issue is that the version of SqlServer Express I had on my new machine was less than that on my old in which I was developing an application in.
So what to do?
Simple !! Update the current version of SQL Server Express on my machine to a newer version.
Checklist to remedy:
1) Check the current version of SQL Server installed on your machine.
2) Download and install the latest version of SQL Server Express from http://www.microsoft.com/sqlserver
3) Install and voila! All is working.