By default, the administrative account that you created when your %BRAND_OFFICE_365_SHORT% organization was created is granted ...

By default, the administrative account that you created when your %BRAND_OFFICE_365_SHORT% organization was created is granted administrator permissions to your %BRAND_OFFICE_365_SHORT% organization. This account can configure all aspects of your %BRAND_OFFICE_365_SHORT% organization and manage recipients located in the organization. If you want additional administrators added to your %BRAND_OFFICE_365_SHORT% organization, you'll need to create them. Administrative and end user permissions that are configured in your on-premises organization aren't transferred to the %BRAND_OFFICE_365_SHORT% organization.