I had some problems installing v 11.4.6 due to scalix-iconv-extras package. Instalation procedure reported: CP51932 converter already installed error: %pre(scalix-iconv-extras-1.2-1.rhel5.i686) scriptlet failed, exit status 1 error: install: %pre scriptlet failed (2), skipping scalix-iconv-extras-1.2-1.rhel5
I repeated the instalation choosing not to install this package. It completes.