How to activate Windows Server 2012 Standard R2 Evaluation to Windows Server 2012 Standard R2 full version

I have installed Windows Server 2012 Standard R2 Evaluation from *.iso file downloaded from microsoft website in Hyper-V virtual machine . The following step by step guide provides the activating to full version. Even if we activate the windows using Server Key, by adding it from My Computer --> Properties --> Change Product Key , it won't be activated. It will give the following error - "That key can't be used to activate this edition of Windows. Please try a different key" Two ways to verify that our product is evaluation: The evaluation notice can been seen at bottom right corner of desktop background. From an elevated command prompt do the following: Determine the current edition name with the command DISM /online /Get-CurrentEdition. It will show "Current Edition : WindowsServerStandardEval" To convert to full version follow these steps: In elevated command promp...