Connectivity to SQL Server 2000 via Linked Server will fail. As SQLNCLI10 Native Client is upgraded to SQLNCLI11, which does not support connectivity to 2000 and earlier versions.The workaround is to use a DSN connection, check my blog post: http://sqlwithmanoj.wordpress.com/2012/12/10/sql-server-2012-does-not-support-linked-server-to-sql-server-2000-workaround/
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