Internal Version Numbers
Software may have an "internal" version number which differs from the version number shown in the product name (and which typically follows version numbering rules more consistently). Java SE 5.0, for example, has the internal version number of 1.5.0, and versions of Windows from NT 4 on have continued the standard numerical versions internally: Windows 2000 is NT 5.0, XP is Windows NT 5.1, Windows Server 2003 is NT 5.2, Vista is NT 6.0 and 7 is NT 6.1. Note, however, that Windows NT is only on its third major revision, as its first release was numbered 3.1 (to match the then-current Windows release number).
Read more about this topic: Software Versioning
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