Answering questions at Microsoft WPC in New Orleans, Microsoft CEO Steve Ballmer said Google's strategy with its Chrome OS isn't clear to him, particularly because its Android mobile-phone operating system is being expanded to netbooks. Ballmer started by noting that he wanted to be respectful, but he added that it's not entirely clear yet what Chrome will be, and on top of that, it isn't scheduled to be outuntil next year. "The last time I checked you don't need two client operating systems," Ballmer contnued, via webcast. "We tried it before. Windows 95 and Windows NT. It's good to have one. So I can't -- I don't really know what's up at Google. Google had addressed the two-OS issue in its post introducing Chrome OS.