Apple should be in a position to keep recording growth of 50 percent or more during the next two years, claims Forrester Research CEO George Colony. At the heart of the argument is mobile apps. Colony notes that nearly 15 million iPads were sold in the device's first year, and in a space of four years, over 90 million iPhones have been sold. Hardware demand fuels interest in apps, which in turn keeps people buying Apple hardware, says Colony.