As quoted by Microsoft “Our design had to follow the revised 3.0 specification precisely in order to enable emerging USB 3.0 hardware. There are also billions of older USB devices that Windows must remain compatible with." The company further quoted, "We decided to start before there were any USB 3.0 devices by building 'virtual' devices. Virtual devices are software representations of real, physical USB hardware: the ports, the hubs, and other devices.”
Though the USB 3.0 enabled PCs will only be available by 2015, you can add the support on your desktop with the help of PCI extension card. Microsoft has invested heavily to construct this tool. Along with USB 3.0, Microsoft will continue to support earlier versions of USB including USB 2.0 and USB 1.1.
About USB 3.0
USB 3.0 specification includes a new, higher speed bus called SuperSpeed in along with the USB 2.0 bus. In other words, USB 3.0 also provides backward compatibility with USB 2.0.
SuperSpeed USB 3.0 will radically increase the rate at which file transfer takes place, with approximately 5 gigabytes per second. USB 3.0 was developed in 2008 by Promoter Group which is made up of HP, Intel, Microsoft, Renesas, ST-Ericsson and Texas Instruments.