Since I obviously cant run zfd 4.01 together with citrix on win2003,,,

which I found out to late.should check in advance.Make mental Note!!

Instead,, upgrade existing zen 4.01 setup to 6.5 in a live
enviroment,,, is it a big deal,,, or does most of the stuff just keep
working after running setup..?

Also,, must client side app's/agent's etc get uppdated directly,,? or
do the install co-exist with older agents during the update..`?