Microsoft has released updated Media files containing Windows Server 2012 R2 / Windows 8.1 Client Update on Volume License Service Center. This new media kit is recommended to be used for any future deployments since it contains all security fixes since RTM. Updated ISO files can be obtained from following sources MSDN (For Evaluation) TECHNET (For Evaluation) Volume Licensing Service Center (Enterprise Deployment) more details please visit http://blogs.technet.com/b/windowsserver/archive/2014/04/14/updated-volume-license-media-available-today-for-windows-server-2012-r2-update.aspx
After obtaining Windows Server 2012 R2 Preview, I thought of upgrading my lab environment. Upon completing Server 2012 R2 Preview upgrade, I noticed that there’s a Windows.old folder in my System drive which takes around 20GB of space. now that I have already upgraded in to Server 2012 R2 Preview and confirmed that all my applications / file are available, I decided to delete Windows.old folder. Best way to do this, is to use Disk Cleanup Tool.