Will not work. Don't even try it. Had one customer try it and it corrupted their farm data store and they had no backup! It is well documented in the XenApp 6.x eDocs to not do this. http://support.citrix.com/proddocs/topic/xenapp65-w2k8/ps-system-requirements-w2k8-xa65.html Important: * Do not install XenApp on a domain controller. Citrix does not support installing XenApp on a domain controller. * Do not join servers running this XenApp version to a deployment with servers running previous XenApp versions (including early release and Technical Preview versions). * You must use the AppCenter from the 6.5 media to manage the XenApp 6.5 farm. Citrix does not support using a console from a previous XenApp release to manage XenApp 6.5 farms. (However, you can use the AppCenter from the XenApp 6.5 media to manage a XenApp 6.0 farm.) Carl Webster Consultant and Citrix Technology Professional http://www.CarlWebster.com<http://www.carlwebster.com/> From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Landin, Mark Sent: Monday, January 16, 2012 4:07 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Xenapp 4.5 and 6.X in same farm? Can a 32-bit Citrix XenApp 4.5 server exist in a XenApp 6.0 or 6.5 farm, or is that forbidden? ********************************** Mark Landin IT Support Analyst IV Information Technology Department T.D. Williamson, Inc. 6120 S. Yale Avenue I Suite 1700 I Tulsa, OK I 74136-4235 Phone: 918.447.5110 I Fax: 918.445.3811 mark.landin@xxxxxxxxxxxxxxxx<mailto:mark.landin@xxxxxxxxxxxxxxxx> I www.tdwilliamson.com<http://www.tdwilliamson.com/> [TDW%20logo%203] ________________________________ This message and any attachments may be a confidential attorney-client communication or otherwise be privileged and confidential. If you are not the intended recipient, any review, distribution or copying of this transmittal is prohibited. If you have received this transmittal in error, please reply by e-mail and delete this message and all attachments