Not exactly:
[link|http://news.netcraft.com/archives/2003/08/17/wwwmicrosoftcom_runs_linux_up_to_a_point_.html|http://news.netcraft..._to_a_point_.html]
"Akamai also forwards the http Server: header from the original server as part of the cached content, and so we report \ufffdMicrosoft-IIS/6.0\ufffd as the web server."