Microsoft Windows Compute Cluster Server 2003 Windows Storage Server 2003 R2 (Basic, Standard, Enterprise, and Workgroup Editions) with Service Pack 2 Windows Storage Server 2003 (Basic, Standard, Enterprise, and Workgroup Editions) with Service Pack 2 Windows Server 2003 R2 (Standard, Enterprise, and Datacenter Editions) with Service Pack 2 Windows Server™ 2003 (Standard, Enterprise, Datacenter, and Web Editions) with Service Pack 2 Refer to Post-installation Considerations for more information. OfficeScan automatically disables some features on server platforms. Microsoft Windows Server 2008 R2 64-bit Hyper-V Microsoft Windows Server 2008 64-bit Hyper-V VMware Workstation and Workstation ACE Edition 7.0 VMware™ ESX/ESXi Server 3.5 and 4 (Server Edition) Microsoft Virtual Server 2005 R2 with Service Pack 1 OfficeScan supports client installation on guest Windows XP operating systems hosted on the following virtualization applications: Windows XP Tablet PC Edition with Service Pack 3 Windows XP Professional for Embedded Systems Windows XP Professional with Service Pack 3