that SUSE Linux has about 28% compared to Red Hat's 62% of the world's business Linux market. He also added that while Red Hat's mainframe Linux marketshare has indeed grown considerably, but that, according to Gartner , "Novell has by far the largest market share, which they estimate at 70 percent." I'm inclined to agree to the numbers Novell cites. In any case, both agree that Red Hat is number one today. And, that's quite true... as far it goes. You see both companies and the analyst firms are focusing on the Linux business market.
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IDC, for example, in its Quarterly Server Reports , counts "server revenue [that] includes components that are typically sold today as a server bundle, including frame or cabinet and all cables, processors, memory, communication boards, and OS." Again, that's fine for as far as it goes, but only some businesses buy Linux as part of a server bundle. A lot, yes, but many companies make Linux servers out of older or generic commodity servers. In my own office, for example, I currently run four Linux servers and none of them came with Linux pre-installed. Or, on a far grander scale, look at Google. Google runs on Linux. But, Google uses its own home-brew Linux on its own servers. Neither mine, nor Google's, servers would ever show up on Red Hat or Novell's sales numbers or in the IDC surveys.
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Who really has the most Linux users? - Computerworld