I wasn't around then, but my understanding is that IBM OS/360 was hugely successful and its successors are still around like 40 years later. It took a huge amo

I wasn't around then, but my understanding is that IBM OS/360 was hugely successful and its successors are still around like 40 years later. It took a huge amount of time, but was ultimately successful. I don't think you have the story quite right.