Apache has long been the leader by far in number of servers it resides on for the internet while Microsoft's IIS has held the number 2 position. However, that percentage lead has dropped below its lowest point since 2000 while nginx is rising to meet it.
From Netcraft:
From Netcraft:
Although Microsoft gained 1.8M sites it recorded a further drop in market share, extending a trend that dates back as far as June 2010. Conversely, nginx was the only major web server vendor to gain market share this month and set a new all-time high of 9.63%. Furthermore, it saw the second largest absolute growth with an addition of 6.9M hostnames.
In terms of Active Sites, nginx gained 1.9M which resulted in it overtaking Microsoft to have the second largest number of Active Sites (22.2M). Apache experienced the greatest rise this month with an addition of 3.7M Active Sites, more than double the increase it recorded last month.