At the Web 2.0 Expo, Tim O'Reilly predicts that Microsoft will emerge as a leading proponent of the open Web, despite the company's tradition of fostering its own proprietary operating systems and development languages. O'Reilly says Microsoft's recent deals to index Twitter tweets and use Wolfram Alpha's APIs for computational data show a shift in its willingness to work with other Web companies. Moreover, the Windows Azure cloud computing operating system is designed to work with open-source technology.