I was going through some data on IIS webservers today and came across Netcraft , which is a website that gives monthly statistical data on webservers from different companies and some other interesting stuff. Not sure if this data can be taken official
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Read the complete post at http://blogs.iis.net/ma_khan/archive/2010/02/25/netcraft-iis-now-serves-50-million-hostnames.aspx