This is because while it was always claimed, indeed stated, that the new version of the operating system would work on older machines, it never did at anything above geological era type speeds.

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Coal is found in many more places a whole geological era's worth of rocks, those of the Carboniferous, are named in its honour and it cannot be pumped around, but can be crushed and burned and so produces baseload power.

ECONOMIST: Unconventional gas