Citrix has released a 64-bit version of its flagship Presentation Server product, which it claims will mean less hardware for more server work.

Citrix Presentation Server 4.0 for Microsoft Windows Server 2003 x64 edition will run 32 and 64-bit apps and make both accessible to any Citrix client, including thin clients and desktops.

If the system is installed on a two-processor, dual-core server running x86-based processors capable of either 32 or 64-bit, it should support approximately twice the number of users of a two-processor machine, Citrix said, because of improved memory and application performance.

The software will also allow IT managers to move gradually to a 64-bit environment because both 32 and 64-bit apps can run on the same server, said Citrix director of platform marketing Anthony Ricco.

Gartner analyst Mark Margevicius called 64-bit "a wonderful thing for server-based computing" because of the generally high costs of moving to server-based systems.

Server-based computing requires a network infrastructure to support it, as well as redundant servers and licensing costs, making it capital-intensive, said Margevicius.

Pricing begins at $290 per concurrent users.