"The Internet experienced its strongest site growth ever last month, powered by a surge in blogs and free web sites. In the June 2006 survey we received responses from 85,541,228 sites, a gain of 3.96 million sites from the May report. This is the largest one-month increase in sites in the history of the Netcraft survey, surpassing a gain of 3.3 million in March 2003, although the 2003 gain was larger in percentage terms (8.5%, compared to 4.7% this month)," according to the Netcraft survey for June 2007.
"Microsoft continues to gain share in the web server market, chipping away at Apache's commanding lead. The number of hostnames on Windows servers grew by 4.5 million, giving Microsoft 29.7% market share, a gain of 4.25% for the month. Apache had a decline of 429K hostnames, and loses 3.5% to 61.25%."
The commentary points out that GoDaddy was a major influence, "with over 1.6M hostnames moving from Apache to IIS this month". However, "Windows also saw solid growth in active sites".
Although Apache's market share fell, there was still an increase in the number of Apache sites, as the graph shows.
Note: Like most hosting companies, GoDaddy offers users a choice of Linux or Windows, and in this case, they are the same price. It's only the parked domains it is moving, which doesn't really change anything except the Netcraft numbrs.