Digitizor: “According to Netctaft’s Web Server Survey, the percentage of websites using Microsoft’s IIS is rapidly decreasing. Netcraft’s survey covers a total of more than 340 million websites.
The percentage of websites using Microsoft IIS has decreased to such an extent that it is now at the level that it was before 1998. Within a one month period between May 2011 and June 2011, Microsoft IIS lost as many as 1.4 million host names while Apache gained 21 million host names.
With the market share of Microsoft IIS down to around 16% only, Apache with a market share of around 65% is the only major web server software left. Other software like nginx also saw a decrease in the market share in the May-June 2011 period – but not as much as that of Microsoft IIS.”