This document provides guidance on writing effective business correspondence through emails, memos, and letters. It discusses identifying the audience and purpose, and using an appropriate tone and style. The key types of business documents are identified as internal communications within an organization versus external correspondence with clients and suppliers. Guidelines are provided on structuring messages clearly with a greeting, purpose, details, and closing. Differences between informal emails versus formal letters and memos are covered. Formatting tips are outlined along with dos and don'ts like using proper spelling and grammar while avoiding large attachments or slang. Activities are included for students to review examples, make corrections, and practice writing their own emails according to an organization's standards.