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software rot
The tendency of software that has not been used in a while to fail; such failure may be semi-humorously ascribed to bit rot. More commonly, "software rot" strikes when a program's assumptions become out of date. If the design was insufficiently robust, this may cause it to fail in mysterious ways.
For example, owing to shortsightedness in the design of some COBOL programs, many would have succumbed to software rot when their 2-digit year counters wrapped around at the beginning of the year 2000. A related incident made the news in 1990, when a gentleman born in 1889 applied for a driver's licence renewal in Raleigh, North Carolina. The system refused to issue the card, probably because with 2-digit years the ages 101 and 1 cannot be distinguished.
Historical note: Software rot in an even funnier sense than the mythical one was a real problem on early research computers (e.g. the {R1}; see grind crank). If a program that depended on a peculiar instruction hadn
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