http://www.microsoftvolumelicensing.com/userights/Downloader.aspx?DocumentId=1869 - time. You may change the mode only one time, from “per server” to “per device or per user.” If you do, you will retain the same number of Windows Server 2008 CALs. You may use Core CALs Suites, Enterprise CAL Suites and BackOffice CALs to access server software used in “per device or per user” mode only. For Windows Server 2008 Terminal Services: Regardless of the mode in which you use the server software, the following apply. * Windows Terminal Services CALs. In addition to a Windows Server CAL, Core CAL Suite or Enterprise CAL Suite, you must acquire a Windows Server 2008 Terminal Services CAL for each user or device that directly or indirectly accesses the server software to host a graphical user interface (using the Windows Server 2008 Terminal Services functionality
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