
Microsoft announced the availability of Windows 8.1 RTM version for the MSDN and TechNet subscribers today. That means, if you have any one of the MSDN or TechNet subscription, you will be able to download it from your subscription page.
General availability of Windows 8.1 will be on 18th October 2013. If you hold a Windows 8 installation, you will be able to upgrade to Windows 8.1 from Store after that.

During the BUILD developer conference on 26th June 2013, Steve Ballmer announced the availability of Microsoft 















If you are a Windows 8 Store application and/or game developer, you may want to provide feature to share text, graphics, links or game score cards to Facebook, Twitter or Email. Windows 8 SDK provides those APIs to implement the feature in your application.