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A very long comment that ignores the one it purports to reply to...

Microservices are called that because they reside within an app that itself provides a service. Otherwise, of course you could call everything and anything 'microservice' but then the term would become meaningless.

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GMail (or any other email offering) is "an app" from many perspectives.

Yes, it is an app. Not a 'microservice'. That's the point.

An app containing many services handling individual, separated aspects of the overall app, connected by queues and standard protocols. Many pieces interchangeable with others. If you'd hide the fact that it's e-mail and wrapped a bunch of HTTP/gRPC around it you could easily sell the same architecture to people as "a messenger build on microservice principles".

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