Mailboxes just hold e-mail messages.
Eudora asks you what you would like to call the new mailbox. To create a folder, check Make this as a folder . For example, you can transfer all the messages from your children into a personal mailbox, and raise the priority of all the messages from your work group to Highest Priority . Filters are very powerful, but using them can be complicated. For more information about using filters, see either the Eudora online help or the manual.