July 8: Google launches operating system

Google has taken direct aim at Microsoft's core personal computer software business, with the announcement of a PC operating system to rival Windows. The system, based on Google's Chrome web browser, is designed for all classes of PCs. Maija Palmer, technology correspondent, explains to Daniel Garrahan why Google is challanging Microsoft's dominance and considers its chances of success. Produced by Darryl Thomson and Josh Noble.