- Despite e-mail, cell phones and other modern conveniences, an important place still exists for the written letter, especially when it is used as a means of business communication. This revised and updated book presents correct business formats, then offers instruction on writing clear and concise letters for every imaginable occasion. Among them are letters of inquiry, credit letters, dunning letters, congratulatory letters, business announcements, invitations to business functions, and many more. Readers will find many sample letters that they can adapt for their own uses. New in this edition is advice and instruction on effective e-mail correspondence.