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Yes, Microsoft skips windows 9 because some code use "Windows 9" for windows 95/98: https://www.reddit.com/r/technology/comments/2hwlrk/new_windows_version_wil

• olliej 6y ago
  When safari 2.0.4 was first released huge numbers of websites broke simply because they detected Netscape 4 by doing navigator.useragent.indexif(“4”)>0 Never underestimate the ability of developer hacks to screw things for years. Many releases after had a lot of paranoia about including the character 4 in the version number