Mitigations against vulnerabilities identified between 2011 and mid-2013.
Features like Hardware-backed Data Execution Prevention (DEP) and Kernel Patch Protection.
"Preactivated" ISOs from third-party sites often contain malware or backdoors. Always scan the ISO with updated antivirus software before use.
A preactivated version of Windows Server 2008 R2 is a version that has already been activated with a valid product key. This means that the user does not need to enter a product key during installation, and the operating system is ready to use immediately after installation.