As "serious" is not defined and subjective
check better
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and the number of running systems is not known/hard to estimate (Linux gets used in embedded environments too, where it will never show up in "server statistics")
Also BSD is implemented in EE. Anyhow since we're speaking of webservers, we have good estimators for this quantity.
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I can only say with 0.99 confidence level, that you are far off topic by now. 
Lol (L)