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Open punctuation is a very popular style in business letters.
Below is an example of a Fully blocked - Open punctuation letter.
Open punctuation means there is no punctuation except in the body of the letter.
In addition, open punctuation makes the page look neater, cleaner and crisper.
The layout will use open punctuation (that is, no punctuation).
An organisation will specify that all its letters must be typewritten on headed paper and use, say, a fully blocked, open punctuation style.
The main difference is that a style has evolved known as open punctuation in which all punctuation outside of the main body of the letter is omitted.