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I did some contracting for a retail bank a good while back and the COBOL source for the term deposit interest calculation routine had been lost a few decades earlier but was still in use. I suggested a rewrite but there was no enthusiasm/support for it - especially as my prototype could not exactly reproduce the rounding. Nobody wanted to have to deal with customer communications to explain why one cent of interest was being paid a month earlier or later than before.

> suggested a rewrite but there was no enthusiasm/support for it

Been there :)

Yes, you always get a "no" for doing that.

Ahaha I'm also working with a bank and "customer communications" is a really nice euphemism for "barrage of class action suits". I'm sitting here in the office laughing out loud.

Missing source code? That's terrifying.

Par for the course.

Totally normal, happened all the time :))