In the Netcraft August 2007 survey they received responses from 127,961,479 sites, an increase of 2.3 million sites from last month. Microsoft continues to increase its web server market share, adding 2.6 million sites this month as Apache loses 991K hostnames. As a result, Windows improves its market share by 1.4% to 34.2%, while Apache slips by 1.7% to 48.4%. Microsoft's recent gains raise the prospect that Windows may soon challenge Apache's leadership position.
The open source Apache has been the leading web server software since the March 1996 Netcraft Web Server Survey. In November 2005, Apache was found on 71 percent of web sites, putting it more than 50 percentage points ahead of Microsoft IIS (20.2 percent). At the time, Apache's market share advantage seemed insurmountable. But less than two years later, Microsoft has narrowed that 50 percent gap to 16.7 percent. The margin is even tighter in active sites, where Apache leads Microsoft by just 12.2 percent.
Apache's lead remains substantial in both categories. It's worth noting that Apache has lost market share to another open source server, lighttpd (1.2% of all sites), and Google (4.4%) as well as Windows. But if Microsoft continues to gain share at its current pace, it could close the gap on Apache sometime in 2008.Full Story At Source