Note that this graph shows only Operating Systems serving less than 40,000 hostnames
The number of sites running Windows Server 2003 has overtaken Solaris 9, in spite of the fact that Windows Server 2003 does not launch until later on this month.
Solaris 9 launched in May 2002. However, Sun seems to take relaxed view about envangelising new operating system versions; even www.sun.com is still running Solaris 8. www.microsoft.com is at the opposite end of the product advocacy spectrum and started running Windows 2003 last July.