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Not to be too pedantic, but...

Felienne Hermans actually implemented a Turing machine in Excel, without using scripting: http://www.felienne.com/archives/2974

There was an HN post about this in September 2013: https://news.ycombinator.com/item?id=6416631

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It looks like it uses one row per step. Excel supports finite rows, and hence this does not prove that Excel is Turing complete. A program like while(true); will eventually run out of rows and terminate.

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