[kwlug-disc] maintaining vs upgrading

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Mandriva 2010.2 Powerpack seems to have been released today for all you 
Mandriva fans (I think that's pretty much just me these days).

I noticed that Mandriva has a maintenance option:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

Does that not seem odd?  Why would I subscribe to get continued updates 
on a previous version instead of subscribing to current versions. It's 
not like MS where new versions are  a new OS, the different versions on 
Mandriva are pretty much seamless transitions.

Perhaps I'm missing something obvious as to why that would make sense to do.