Re: odd EOLing
IBM withdrew the old AIX Enterprise Edition which included either AIX 6 or AIX 7.1 and replaced it with two new products:
- a new AIX 7.1 Enterprise Edition V1.1 and
- a new AIX 7.2 Enterprise Edition V1.1
The End of Support date for the old Enterprise Edition for AIX 6 was synced up with the End of Support for AIX 6 Standard edition, April 2017.
But the End of Support date for the old Enterprise Edition for AIX 7.1 had a shorter End of Support date because it was replaced by the new AIX 7.1 Enterprise Edition V1.1.
Part of the confusion is that IBM rules state that products can only be withdrawn in April or September (which is why the old AIX Enterprise Edition was withdrawn on September 29).
But IBM could not announce the new AIX Enterprise Editions because US accounting laws require that the product must ship in the same quarter as the announcement - so the new product announcement was done on October 5, in the fourth quarter.
I explained it better in my blog at https://kruemcke.wordpress.com/2015/10/05/aix-7-2-and-october-power-software-announcements/