http://blogs.msdn.com/b/sqlnativeclient/archive/2008/05/30/sqlncli-msi-for-sql-server-2008.aspx
关键是这位老兄的回复，第三条
6 Mar 2013 9:13 AM
You can find the sqlncli.msi in a SQL Server feature pack:
Microsoft SQL Server 2008 SP3 Feature Pack - www.microsoft.com/.../details.aspx
Microsoft SQL Server 2008 R2 SP2 Feature Pack - www.microsoft.com/.../details.aspx
Microsoft SQL Server 2012 SP1 Feature Pack - www.microsoft.com/.../details.aspx