[Xtng]

Ok...

If this POST is useful for somebody, I've found the problem in a missed library: libXp.

Just search the library through yum:

yum search libXp

You'll get all available libraries for your OS version:

Loaded plugins: refresh-packagekit
================================================== ================================== Matched: libXp ================================================== ===================================
libXp.i586 : X.Org X11 libXp runtime library
libXp.x86_64 : X.Org X11 libXp runtime library
libXp-devel.i586 : X.Org X11 libXp development package
libXp-devel.x86_64 : X.Org X11 libXp development package
libXpm.i586 : X.Org X11 libXpm runtime library
libXpm.x86_64 : X.Org X11 libXpm runtime library
libXpm-devel.i586 : X.Org X11 libXpm development package
libXpm-devel.x86_64 : X.Org X11 libXpm development package

Install it with yum (E.g. for x86_64):

yum install libXp.x86_64 libXp-devel.x86_64

And installl your Zimbra Desktop as user, not root.

By the way... In Fedora 11 I've installed i586 supported without problems.

Adeu!