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I think Apple's site is.

Haha, they better be...that would be like MS using Linux boxes to host their site. That wouldn't go over too well, if the company doesn't trust their tech how would they expect their customers to.

I don't know of any other sites that use it.
 
Actually, I seem to recall that Apple.com aren't hosted on Macs – and something vaguely about Sun perhaps?
 
When most of Apple's stuff was deployed OS X client wasn't very mature, let alone the server. If stuff is deployed and stable and working, then it tends to get left that way.

For Apple's developer site, they send back this:
Server:Apache/2.2.9 (Unix) PHP/5.2.6 mod_ssl/2.2.9 OpenSSL/0.9.7l mod_jk/1.2.25 mod_perl/2.0.2 Perl/v5.8.8
So they use php on the backend for the developer site and WebObjects (Java) for their store and other areas.

For their homepage and other areas, they just send back this:
Server:Apache/2.2.9 (Unix)
The Apache could be running on any UNIX like system.

CUPS is hosted on Red Hat:
Server:Apache/2.2.3 (Red Hat)

All the other Apple sites (Webkit, Mac Ruby, Mac OS Forge) send this back:
Server:Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8k DAV/2 mod_python/3.3.1 Python/2.5.4

I've read the use a combination on Sun Servers and XServes for MobileMe.

The whitehouse.gov sends back this:
Server:Microsoft-IIS/6.0
So you know they're on Windows Server.
 
Haha, they better be...that would be like MS using Linux boxes to host their site. That wouldn't go over too well, if the company doesn't trust their tech how would they expect their customers to.

Well actually, Microsoft uses the Akamai CDN to balance their content load on certain high traffic sections of their site; and Akamai's servers run on linux. So technically Microsoft does use linux indirectly.
 
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