Even more fun..<p><pre><code>  SunOS 4.1.4 was retroactively renamed Solaris 1.1.2.
  
  SunOS 5.6 was Solaris 2.6, but
  SunOS 5.7 was Solaris 7.
  
</code></pre>
To Sun&#x27;s eternal credit, they were smart about keeping the internal versioning and the marketing versioning separate.<p>Even to this day, so far, Oracle hasn&#x27;t messed with &quot;SunOS&quot;.