By default, when signing into Windows with a Microsoft account, Windows syncs some of your settings and data with Microsoft servers, for example “web browser history, favorites, and websites you have open” as well as “saved app, website, mobile hotspot, and Wi-Fi network names and passwords”.
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Windows generates a unique advertising ID for each user on a device. This advertising ID can be used by third parties, such as app developers and advertising networks for profiling purposes.
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The BitLocker recovery key for the user’s device is automatically backed up online in the Microsoft OneDrive account.
The wait is over! How your personal data is (ab)used
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