What does a computer-aided design leader do after 30 years in the market when confronted with mobility and tablets? If it’s Autodesk, it reinvents itself. Well, not completely. Autodesk, maker of the well-known AutoCad suite of design products, continues to support its core customers. But here’s the thing: It took 30 years to build that very loyal base of 17 million customers; it took just three years to build its mobile apps base of 140 million users.