In-box items refer to the items that are received in a person's inbox, such as emails, messages, FAXES, and MEMOS. Messages are 8 letters long and refer to written or electronic communication sent from one person to another. FAXES are 5 letters long and refer to documents that are sent electronically from one fax machine to another. MEMOS are also 5 letters long and refer to short written messages sent within an organization.