Effective communication requires speaking with a unified voice in a unified format; in other words, consistency creates credibility.
A custom style guide will help your writing be more consistent. Clear Writing Consultants will advise you on accepted styles and create your own in-house guide to improve your communication products.
Style guides also keep employees up to date on the rules of punctuation and grammar. Some things have changed since you were in third grade! A custom style guide can clarify what works best for your company.