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Here you will learn how to set up or change the administrator user for your Microsoft Exchange 2013 account.
The administrator can assign read and write permissions to other mailboxes for public folders, create, edit, and delete resource mailboxes.
Log in to 1&1 IONOS and select the relevant contract.
In the Mail section, click Manage email addresses.
In the mailbox overview, click Set administrator.
In the Administrator box, select the mailbox you want, and then click Save.
The assignment can take a few minutes. As soon as this is complete, you will find a corresponding entry in the mailbox overview.
Please note: The administrator role can only be assigned to one mailbox. However, you can assign them to another mailbox at any time later by repeating this step.