Los Angeles - Microsoft released key details Tuesday of the next generation of software that it hopes will run the world's computers.
The software giant, whose dominance is under threat, said Windows 7 will replace the disappointing Windows Vista in January 2010.
Microsoft said the new operating system was designed to function like a tighter version of Vista, which launched in 2006 but was widely derided as a "system hog" that slowed down computers with features that most users never accessed.