Here's a quick way to determine the account type you use to sign in to Microsoft 365 or Office:
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Microsoft account is an email address and password that you use with Outlook, Outlook.com, Hotmail, Office, OneDrive, Skype, Xbox, and Windows. When you create a Microsoft account, you can use any email address as the user name, including addesses from Outlook.com, Yahoo!, or Gmail.
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Work or school account is a Microsoft 365 account that was provided to you by your organization's IT department. This is the account you use to access your work or school email and your organization's web resources.
For more information, read What is a Microsoft account and a work or school account?
