Apersonal business letter may be written by

a personal business letter may be written by an individual such as a boss, or a coworker.

a personal business letter is a letter that is written by an individual to a company or between colleagues that are working for different companies. personal business letters maintain relationships with professional contacts, and it is written for various reasons such as to commend an employee, to request for an exchange or return of a product, or to request for donation of money or service.