Original sentence: Microsoft is maintaining a policy of silence concerning discussion of plans and aspirations for Windows 7 as they focus on the release and marketing of Windows Vista, though some early details of various core operating system features have emerged
Edited sentence: Microsoft is maintaining a policy of silence concerning discussion of plans and aspirations for Windows 7 as they focus on the release and marketing of Windows Vista, stating that Microsoft does not want to promise features and then fail to deliver, as happened with Windows Vista Ultimate, though some early details of various core operating system features have emerged