For many businesses, email is their cockpit. It is through email that their customers experience much of the company's brand, and how they navigate through and into the company's offerings. Like a car, it's comforting to step in and find everything exactly the way you like it. But also like a car, it's exhilarating to upgrade to this year's model, with modern looks, features and smells. When you're considering an email redesign, how do you strike a balance between consistency and innovation? How do you find the middle ground between boring and inscrutable?