Comparison of Message-Oriented Middleware (MOM) and Object Request Brokers (ORBs)

Conclusion:
From above we can see that, ORB is a sunrise middleware with the new technology in the middleware market. And also, with the increasing popularity and advancement of ORB, from my point of view, it will be the better middleware for linking legacy system to the web.
The fact behind ORBs is this: Many applications need access to the same set of services as well as to other applications. The reality of computing today is heterogeneous computing hardware and operating system platforms, plus applications built with a wide variety of development tools and languages. To get all of those components talking to each other, the enterprise needs a consistent, object-oriented architecture. [John, 1998]
And with the increasing need for applications in one company to share data with business partners or suppliers, this kind of standardized approach can greatly simplify the integration chore.
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