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Application servers were once standalone products. An application serverin an organization often hosted new applications side by side with messaging servers, Web servers and customer relationship management (CRM) servers. Then it became clear that the core engine required to build, deploy and manage applications containing new business logic could be defined as a single set of core application server functions. And if this common engine could be standards-based, it could more quickly and easily become the foundation for any number of specialized software packages.This evolution has taken place rapidly, because an OS for the Internet directly addresses acute problems faced by many enterprises, independent software vendors (ISVs) and solution providers.
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