The driver named as "SQL Server" was released with SQL Server 2000. It's best to use a driver version consistent with the version of the SQL Server instance, else you cannot take advatage of newer features, including data types. The Native Clients are advertised as being backward compatible so you could get ahead of the curve and implement the SQL Server 2012 Native Client (11.0) and that should support whichever version of SQL Server you're using.