I have read from many sources that the majority of the websites are running on Linux and UNIX like operating systems. So out of curiosity, I checked out what are the sites that I visit most often running on. I used http://uptime.netcraft.com/up/graph to get what each site is running, and the result is shown below:

Site

OS

Share

zdnet.com

Linux

62%

Linux and UNIX like OS: 86%

cnet.com

Linux

news.bbc.co.uk

Linux

slashdot.org

Linux

osnews.com

Linux

Google.com

Linux

w3.org

Linux

cnn.com

Linux

pcworld.com

Linux

bestbuy.com

Linux

consumerreports.org

Linux

codeguru.com

Linux

wikipedia.org

Linux

Flickr.com

Linux

space.com

Linux

weather.com

Linux

vmware.com

Linux

sourceforge.net

Linux

dice.com

Linux

npr.org

Linux

pricegrabber.com

Linux

nextag.com

Linux

intel.com

Linux

gnu.org

Linux

betanews.com

Linux

mailinator.com

Linux

youtube.com

Linux

symantec.com

Linux

nasa.gov

Linux

amazon.com

Linux

captcha.net

Linux

ibm.com

AIX

2%

yahoo.com

FreeBSD

6%

tomshardware.com

FreeBSD

netcraft.com

FreeBSD

zipzoomfly.com

Solaris

14%

walmart.com

Solaris

circuitcity

Solaris

sears.com

Solaris

shutterfly.com

Solaris

verisign.com

Solaris

ams.org

Solaris

computerworld.com

Unix

2%

trendmicro.com

Win 2000, IIS 5

10%

Windows 14%

ebay.com

Win 2000, IIS 5

extremetech.com

Win 2000, IIS 5

pcmag.com

Win 2000, IIS 5

newegg.com

Win 2000, IIS 5

microsoft.com

Win 2003, IIS 6

4%

pinvoke.net

Win 2003, IIS

And indeed, a whopping 86% of these sites are running Linux or UNIX like operating systems. What is more interesting is that among the 14% that runs on Microsoft Windows, only 2 of them (4%) is running Windows 2003. And of course, one of them is Microsoft.

Of course, these are just the sites I visit most often, I am sure that the statistics vary from person to person, but the picture is quite clear…

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