Recent college graduates often struggle with the difference between academic and business writing. The University of Houston’s Academic Center recently published a good article that delineated key differences:
There is one other very significant difference not listed in this article: business writing needs to be clear and concise.
Academic writing, by contrast, is more often focused on development of thought, and length is encouraged. Students are often rewarded with higher grades if a paper is longer, uses an impressive vocabulary, and/or complex sentence structure. Business writing is different: one should write to express, not impress.
This does not at all mean business writing should be “dumbed down.” Writing clean, short documents is harder. As Blaise Pascal wisely stated,