It was late January when the Brookfield, Wis.-based Fiserv rocked the core system universe, announcing it had acquired competitor and DNA core architect Open Solutions for roughly $1 billion, much of that in debt assumption.

Then Fiserv dropped another bomb, saying it was killing off its Acumen core. The product had been billed as a breakthrough, but it mainly triggered acrimony and disappointments—as well as some litigation—involving the handful of early adopting credit unions.


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