I have a HP-380 G2 server which is a 64bit server.
I have tested the zcs3.01_GA160 with installing FC4 without any problem.
But it came up problem on loading admin console using the same zimbra version with installing on SUSEES9 32bit OS.
I found some threads which were talking about zimbra is not supporting on a 64bit server. I am sure is it the same case to me.