Once you create a box about a given character, i.e. [email protected] for example, there is no way to change its name.
Sometimes, however, there is a need for a new person to have access to the archive and thus be able to continue working in the case of a personal mailbox created for an employee who is no longer in the company. In this case, you need to create a new email inbox and use the option to import messages from the old inbox.