When you delete a mail user, the Do not display in address lists option is enabled and the mail user is no longer shown in address books. In addition, the Microsoft Entra ID user account that is linked to the mail user is deleted.
NOTE: As long as an account definition for an identity is valid, the identity retains the mail user that was created by it. If the account definition assignment is removed, the mail user created through this account definition, is deleted.
To delete a mail user
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In the Manager, select the Microsoft Entra ID > Mail user category.
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Select the mail user in the result list.
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Click
in the result list.
- Confirm the security prompt with Yes.
in the result list.