Why you need a Microsoft account, or work or school account …
https://support.microsoft.com/en-us/office/why-you-need-a-microsoft-account-or-work-or-school-account-with-microsoft-365-or-office-914e6610-2763-47ac-ab36-602a81068235
WEBA Microsoft account is a free account you use to access many Microsoft devices and services, such as the web-based email service Outlook.com (also known as hotmail.com, msn.com, live.com), online apps like Word or Excel for the web, Skype, OneDrive, Xbox Live, Bing, Windows, or the Microsoft Store.
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