According to a report in the Financial Times, the use of Microsoft Windows is being “phased out” at Google, in part due to security concerns stemming from the hacking incident in China earlier this year. The FT report cites unnamed Google sources for the news. “Linux is open source and we feel good about it,” one employee was quoted as saying. “Microsoft we don’t feel so good about.” According to the report, continuing to use Windows now requires approval from the company’s chief information officer. Meanwhile, a Microsoft spokesman mocked the decision on his Twitter account.