A family of Microsoft word processing software products for creating web, email, and print documents.
MS connects using HTTPS encrypted connections to send your information to their servers.
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How paranoid do you want to get. Can you trust what MS posts as its policy?
The question is while right now they say they don't save or share your information, how much do you trust them to keep those promises. At any point the could decide that they can make more money selling your information to other companies.
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That link you provided links to MS docs pages that describe MS's official policy on how they transfer and handle data
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