Just caught this on Slashdot - NYSE is undergoing system migration to Unix and Linux.
I would suppose this marks a major leap in the use of open source software, and the decision by NYSE definitely has not been a simple one to make. Given the complexity and importance of the Stock Exchange systems, the risk/benefits analysis must have been
But it would seem that the major reduction in cost of operations was the main driver of the switch. Francis Feldman, the vice president of the shared data center for Securities Industry Automation Corp. (SIAC), the NYSE's technology arm, estimates the move will halve the cost of transactions, and though he wouldn't detail how much that would mean on a yearly basis, he said it is "serious financial savings, very serious."
It also underscores the industry acceptance of open source software and elevates its to becoming on par with commerical software in terms of the critical factors of realiability, robustness and security amongst others.
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