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>Here's what I wonder. MS has done some amazing things in SQL Server with the Columnstore index and Hekaton (in-memory optimized OLTP). These capabilities can speed up queries anywhere from 5-20x. I wonder if those things leverage what was in Rushmore in any way.

I saw them at a meeting in Malvern and they are dazzling.
I personally can't see how Rushmore could be involved there, but even if it were, isn't it a bit a stretch to conclude that releasing VFP code would jeopardize the copyright on SQL Server?