If a user wants to make a new paragraph, he or she needs to double-hit the key.
No matter if the Enter key or Shift+Enter keys are used, always only a new line of text is created. In Outlook, however, there is no difference between these actions. In MS Word and also other text editors, it is common practice to treat the Enter key as a new paragraph and the Shift + Enter keys combination as a new line of text.
This problem specifically refers to the general paragraph rules.
to the one used in the previous message or imposed by the default style. When sending an email (a new message, reply or forward) in Outlook, the program has a nasty habit of changing the font face, size, paragraph spacing, etc.