Microsoft plans for Windows 9

The software giant is expected to unveil details of Windows 8's successor - Windows 9, code-named ''Threshold''. The new operating system is slated to arrive in stores by mid-2015, less than three years after Windows 8 was released to mixed reviews. Just as many Windows users skipped Windows Vista and moved straight from Windows XP to Windows 7, Microsoft will be hoping that those dissatisfied with Windows 8 will instead make a quick transition to Windows 9.