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> And the advantage of using "Web Services" for these applications, over
> existing technologies like CORBA, DCOM or MQSeries, is what?
Avoid purchase of third-party infrastructure. It's great to have common
data syntax, networking protocols, why not app protocols? (Give credit to
BEA, for doing the equivalent of turning on a dime and moving from
"legacy middleware" to WS-I founder.)
Fidelity  expects to eventually toss 3/4 of their current IT
middleware, both software and servers.