1. Chrome OS Google's upcoming Web-based operating system, Chrome OS, could pose a major threat to Microsoft. Although the software won't compete with Windows in the desktop and notebook markets, it will play a key role in netbooks. If the Chrome OS infiltrates the corporate world Microsoft will need to respond with a more capable version of Windows 7 to run on lightweight computers. The company might even want to consider a real, full-fledged Web-based operating system.