Mobile devices are one of the weakest links in corporate security. Executives are wrestling with managing a proliferation of devices, protecting data, securing networks, and training employees to take security seriously. In our Tech Pro Research survey of chief information officers, technology executives, and IT employees, 45% of respondents saw mobile devices as the weak spot in their company’s defenses. (Employee data was cited by 37%, followed by wireless access of networks at 34% and bring-your-own-device efforts at 29%.)