hmm.. bear in mind the 'not supported' list from citrix Functionality Not Supported The following list contains functionality not supported by this version of Citrix Presentation Server: . Novell NDS . Smart cards . Philips SpeechMike . Installation of Network Manager plug-ins (monitoring of Presentation Server x64 Edition is supported using plug-ins installed on supported platforms). Refer to the Network <http://support.citrix.com/kb/entry%21default.jspa?categoryID=619&externalID =CTX106453> Manager Administrator's Guide for details about supported platforms. . Secure ICA . .NET 2.0 . Client Database and Distribution wizard . Oracle . Port sharing between IIS and XML service . TWAIN (supports 32-bit applications only) Functionality Supported through Interoperability with 32-Bit Servers The following components must be installed on a 32-bit server: . Installation Manager Packager for Citrix Presentation Server (see "Using Installation Manager Packager to Create Packages" below) . The Citrix license server and the License Management Console . Conferencing Manager for Citrix Presentation Server . Web interface for Citrix Presentation Server And I recall reading a Ms article about issues with 32bit plugins and macros in office.. see if I can dig out the link... _____ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Steve Parr Sent: 23 February 2006 03:35 To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: How good\stable is 64 bit Citrix Presentation Server 4? Sounds like very well suited to run most 32 bit applications then? -----Original Message----- From: Jeff Pitsch [mailto:jepitsch@xxxxxxxxx] Sent: Wednesday, February 22, 2006 10:22 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: How good\stable is 64 bit Citrix Presentation Server 4? The 64-bit of PS4 is really the 32-bit version with only those components upgraded that needed to be to run in 64-bit (for example, printing being the biggest piece). Jeff On 2/22/06, Steve Parr <sparr@xxxxxxxxxxxxx> wrote: How good\stable is 64 bit Citrix Presentation Server? How many more users can it scale to vs. 32bit presentation server or compared to XP when running a 32 bit app? Have there been any issues with it and how long has it been out? Would you run a mission critical app on it at this relatively early stage in it's development? Ie. how stable has it proven to be? Steve Parr Metroland Printing, Publishing and Distributing Ltd.