This document outlines four types of business messages: positive, negative, neutral, and persuasive. Positive messages convey good feelings through letters like appreciation and thanks. Negative messages convey disappointment through letters like disapproval and refusal. Neutral messages convey no feelings and contain information requiring action, like reports and reminders. Persuasive messages aim to get the reader to agree with the writer's point of view through communications like invitations and brochures. Examples of each type are also provided.