Les Mikesell wrote:
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To overgeneralize, that's one of the big differences between free and commercial software. Commercial software that has a customer base that they can't afford to lose will rarely break backwards compatibility, or if they do, they'll provide conversion tools to manage the migration.
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Either you never dealt with Apple abruptly terminating support for your hardware - the CPU for instance - or the memory was so painful that you blocked it out :). On the flip side, Apple fans seem to be unusually resiliant. I'm not bitter...