What is a Microsoft account? - Microsoft Support
http://go.microsoft.com/fwlink/?LinkID=617350
WEBA Microsoft account is a personal account required for access to Microsoft’s products and services. What is a Microsoft account used for? You need a Microsoft account to sign in to your Windows pc, Xbox console, or any of Microsoft’s products and services, including Office, Outlook.com, OneDrive, Xbox Live, Microsoft 365, Family Safety ...
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