On Jun 1, 2:59 pm, Bruce Johnson <[email protected]> wrote:

> It goes :
>
> Major.Major minor.minor.subminor (if you have that.) Each step is a whole 
> integer.
>
> Major is for truly significant changes: OS 7, OS 8, OS 9, OS 10
>
> Major minor is for significant changes within the major. 10.2, 10.4, 10.5, 
> etc.
>
> Apple has mostly, since OS 7.6, sold each of these as a paid upgrade. A few 
> were updates, like 8.0-8.1, 9.0-9.2.2 and 10.0-10.1, but 8.1 to 8.6 was paid, 
> and every OSX version since 10.2 was paid.
>
> Minor are the updates within a paid update, they're free (at least Apple's 
> are). 10.4.1-10.4.11 Eleven separate updates were shipped for 10.4 before 
> 10.5 was released.

To put  a finer point on this, Apple calls the versions one pays for,
such as 10.2, 10.6 "upgrades."  The free changes denoted with the
second decimal such as 10.6.2 are "updates."

Al Poulin

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