It is important to write all workplace communications (even short emails) in a professional way. This is because professionalism is important to be maintained at the workplace to show compliance in an organization. There must be strict discipline in an organization. Otherwise, there can be some employees trying to take advantage of a weak system by using colloquial, slang or abusive language more often. If any third person of the same organization or any other organization reads an unprofessional email communication between two employees, the third person might feel awkward and can get a bad impression about the employees and the organization.