In the latest Netcraft Web Server, for January 2012, the lightweight open source web server software NGINX amassed more active sites than Microsoft Internet Information Server for the first time.
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That makes NGINX the second most used web server software in the world right now, only trumped by Apache.
Let’s look at the numbers.
NGINX is bigger than IIS for active sites
Looking at the development of the top four web server software packages from January 2011 to January 2012, we get this chart:

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