Final answer:
Casual conversations are not typically considered formal communication. Formal communication includes structured and professional formats like memos and emails that adhere to specific etiquette.
Step-by-step explanation:
The component that is NOT typically a part of formal communication is C) Casual conversations. Formal communication in a professional or business context usually involves structured formats like memos and emails that are intended for official documentation of messages and follow certain protocols or etiquette. Casual conversations, on the other hand, are informal and might not adhere to the same level of professionalism or record-keeping as formal communication. Moreover, emails should be written with a professional tone and use netiquette to ensure a positive impression online, and personal communication should typically be separate from business communication.