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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.
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>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?

When MS purchased Fox, a frequent talking point was MS wanting to use some of Rushmore for future database efforts.

Rushmore had bitmap index technology, and the Columnstore Index (and Vertipaq, which is making its way across several MS efforts) optimizes high cardinality column values (like foreign keys in a fact table) using some sort of bitmap as well.

I have no idea if Rushmore wound up playing a part in MS SQL and self-service BI offerings these days, just speculation.