Microsoft has announced yesterday Windows 8.1 ,the upcoming update for over 1.5 billion Windows 8 users world wide. In a features briefing ,the media and participants got to know the key features of Windows 8.1. Microsoft plans to offer the update starting from April 8 this year. The update will be delivered via internet as like a service pack . You do nothing for it ,just wait . Head off to know the new features now ..