Once the alarm was raised loud enough that people started to take it serious, systems were tested in stimulations, code or equipment was identified as problematic and either fixed, replaced or a work around created. I was part of that effort and by the time it was ready to roll over to 2000, I was pretty confident all would be okay. I will say that we had to replace some outdated systems at our company as they absolutely failed at cut over. This would have resulted in some slowdowns in production but we would have limped along.
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