Old software: The savior and scourge of IT

Some companies -- like Apple -- seem to think that older versions of their software simply vanish from the world when new versions are released. Not only is that not true today, it’s never been true.

Mainframes running mission-critical Cobol apps persist to this day in major corporations and governments. AS/400 green screens are still in use in huge numbers. Windows XP-based point-of-sale systems are everywhere. An ancient Commodore Amiga still runs the heat and AC for a school...

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