Hey @Bob Laird ,
An organizational account, previously known as a Microsoft Online Services ID, is an account created by an organization’s administrator to enable access to Microsoft organizational services or Microsoft Azure subscriptions, such as Office 365 or Intune. Organizational accounts are managed by an organization’s administrator through Azure Active Directory and are usually in the form of username@orgname.onmicrosoft.com.
Learn more at Microsoft Account for Organizations FAQ.
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Sincerely,
Olga