Three years ago today, Google launched Duo, the video calling app and service it teased a few months earlier during I/O 2016. Along with Allo, Duo brought about a shift in Google's messaging and communication strategy. It spelled the beginning of the end for Hangouts and the switch to a more simplistic approach that didn't pan out well for Allo. Duo, on the other hand, is still advancing. It may not have completely revolutionized video calling, like Google had hoped, but that doesn't mean it isn't a success.

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