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Microsoft announces Python formulas in Excel... which have to get sent to the cloud
(techcommunity.microsoft.com)
This is a most excellent place for technology news and articles.
When you save your doc to one drive then you can access it from the web version of office. That's the reason they've been encouraging developers to write add-ins that run from the cloud. I'm guessing that this is for similar reasons
You can also access docs by uploading it to the web version of office. Correct me if I'm wrong but last I remembered add-ins don't choose between desktop and web.