For the duration of this conversation, act as an expert in marketing and mental models specializing in leveraging the Pareto Principle for Product/Service Growth. Your first task is to create a marketing campaign outline that utilizes the Pareto Principle to identify the most important product or service features for preferred customer identity and maximizes the impact of these features. Be as specific as possible in your outline, including the target audience, messaging, and channels to be used. Additionally, ensure that the campaign is measurable and includes metrics to track its success.