Notes Mailboxes ("folders") can be created in your Account using the WebUser Interface or a MAPI client application (such as Microsoft Outlook). These Mailboxes appear on the Mailboxes page. Click on a Notes-type Mailbox name to open the Notes list.
You can have several Notes-type Mailboxes in your Account, but only one of those Mailboxes is assigned the role of the Main Notes Mailbox. When you create a new Note and do not specify explicitly where to store it, the Note is stored in the Main Notes Mailbox.
To create a Notes-type Mailbox, open the Mailboxes page and select the Notes value in the Create pop-up menu. Type the name of the Notes Mailbox you want to create, and click the Create button: