The lesson for business communication here is that whatever you write, however you write it, is okay — as long as you accept that your audience will be reduced for every slice of yellow fruit you add to your tomato sauce. In other words, if you do not conform to the norm, people will stop listening to you not because of what you are saying, but because of how you are saying it.
The proper use of paragraphs.
Simple sentences.
The primacy of the first sentence.
Reading vs. scanning.
Tone of voice.
Humor.
Read this HBR blog post