The Launchpad is a series that introduces Mashable readers to compelling startups. If you would like to have your startup considered for inclusion, please see the details here. Name: Tipbit One-Liner Pitch: Tipbit aims to be a smarter and more productive email client for mobile devices, starting with the iPhone. Why It’s Taking Off: The app serves as an all-in-one command center to view your email, calendar, contacts and documents If someone were to brainstorm a list of people who might try improving the email experience for an Apple product, a group of former Microsoft employees probably wouldn’t be on the shortlist. But Gordon Mangione decided to do just that with Tipbit.