Microsoft Windows Small Business Server 2011 Premium Add-on, 64-bit, 1Clt DevCAL, DUT. Software type: Add-on. Minimum hard disk space: 120000 MB, Minimum RAM: 8192 MB, Minimum processor speed: 2000 MHz. Language version: DUT. Minimum system requirements: VGA 800x600 DVD-ROM, Minimum processor: Quad core, Compatible operating systems: Windows XP Professional (SP2) Windows Vista Business Windows 7 Windows Mobile 6.0+