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The real question: will Office 2019 produce documents that can't be read in older versions? It's one thing to say "you need the latest OS to run the latest Office" but another thing to say "everyone you interchange documents with needs the latest OS and the latest Office"...

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I've worked on Office. There's a ridiculous amount of effort put into file format backwards compatibility. Someone I know had to consider Office 2007 compatibility when working on a feature within the last year.

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