Citrix Presentation Server 4.0 is the latest version of the popular server application for virtualizing large numbers of client systems on the one large server. The X3 Architecture servers are a family of high performance IBM System x servers, with four processor sockets and support for up to 64 GB of memory and six high-speed PCI-X slots. This paper describes what's new in Version 4.0 of Presentation Server and explains how the 64-bit combination of hardware, operating system, and Citrix application supports a greater number of users than the 32-bit equivalent. The paper also explains the migration steps that are available to move you to 64-bit processing, complete with migration strategies that eliminate user downtime.
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