I can't tell you how many times over the years I've read about the impending demise of email. There's been a long line of purported successors jockeying for position, aiming to disrupt the space. Various social channels, SMS and instant messaging quickly come to mind. All have been unsuccessful in their pursuit. Sure, email is a flawed, imperfect and overwhelming medium with plenty room for improvement. But it's this need for improvement that presents a window of opportunity for innovation. It's the reason why sagacious approaches to email such as Inbox Zero are being developed. New apps and services have sparked innovation within the email space and this tried and true communications platform is reinventing itself, at least in the business world. There are a variety of influen...