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From what I understand they are using React Native.

I too find it hard to believe they would drop the native Windows and OSX versions of Outlook, Word, Excel, for apps written in React Native. But Microsoft has offered many surprises lately...

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We're talking 50M SLOC and 20+ years of development for native platforms. I highly doubt that they will let that go in favor of an JS app.

Outlook on the web is certainly better than the application on windows... word won't be too hard. Now excel, that's the one I'd be surprised to see.

Try doing a mail merge in owa

If they can charge for a subscription they will let all of that go in favor of an JS app.

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