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When first signing up for Office 365, an acount is created with email address firstname.lastname@example.org. This was the default administratior account until I had setup my own DNS entries - I now login to the admin portal under email@example.com.
Am I able to safely delete this first user account from my user list?
yes, you can delete it BUT you must first grant administrator access to another account to do this; if you are connected with this account, you will not be able to do anything AND if you delete this account without granting admin access to another one, you will be in trouble
Senior Solutions Architect
MVP Office 365 - MCITP Office 365
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Is the reply above answer the questions?