Microsoft Windows Server 2012 - 1 User CAL Type: License Operating Systems Supported: Windows Packaging: OEM Disclaimer: Use of this OEM System Builder Channel software is subject to the terms of the Microsoft OEM System Builder License. This software is intended for pre-installation on a new personal computer for resale. This OEM System Builder Channel software requires the assembler to provide end user support for the Windows software and cannot be transferred to another computer once it is installed. To acquire Windows software with support provided by Microsoft please see our full package Retail product offerings.