A family of Microsoft word processing software products for creating web, email, and print documents.
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As suggested by Ferdinand Nagalig, excessive save prompts have been linked to the use of Copilot. Beyond that, note that certain actions in Word (updating fields, printing) may trigger save prompts (applies to Word for Mac and Word for Windows alike).
Sometimes, exiting Word and renaming the Normal template may fix inexplicable and unneeded requests to save docs.