Man, of all the information the chart in that article provides, nginx edging over IIS is the last thing that I would have noticed! So many other things of interest in this chart, like what caused the rapid decline in IIS use in 2009, what caused a surge of use of apache in 2011, etc.
Although, looking at the graph in greater detail, I wonder what is really going on here. Looks like all of the data 'jumps' in 2011, as if they suddenly found or had access to more server information.
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