I wrote a piece, which ran this morning on Fortune, about why all business leaders need to start thinking -- today -- about how mobile will drastically change their businesses. Change happens fast, and in just a few years the enterprise will look vastly different from how it looks today. I'll also discuss this topic during next week's Fortune Brainstorm conference as part of the "Defending the Device" panel. We hear so much about the 'mobile enterprise' that it's difficult to really know what it all means, or why it matters. A future where employees work from the device of their choosing intimidates many business leaders, causing them to fret about complexity and the security and compliance implications of an increasingly mobile world. It was all so much easier before. But lamenting the challenges of mobile is shortsighted and ignores both its inevitability and its massive potential.