You may recall headlines to this effect back in January, when the same Netcraft survey showed that nginx had taken the number 2 spot in active sites, a sampling method used by Netcraft to predict active multiple sites on single IP addresses. The numbers I am referring to here are Netcraft’s actual surveyed sites that have responses to the automated queries.
Looking at these numbers, IIS hasn’t seen a rise in market share at all in the last twelve months–though it came close in July 2011, when its market share only fell by 0.01 percent. Conversely, nginx has had increases in market share for eight of the last twelve months.