Most of the traditional EAI vendors don't do SOA well. It's the issue around service- vs. information-oriented...
integration. They are very different notions, and most older integration technology was set up for information integration.
ESB is nothing more than a queuing system with Web services interfaces, thus most can qualify as an ESB if they have those components.
Dig Deeper on Migrating from ESBs to microservices
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