Zimbra works fine on CentOS 4.2, I curently have it installed. I don't know what's happened on your system but 'ld-linux.so.2' is part of glibc. This from my system:
Code:
# rpm -qa | grep glibc
glibc-devel-2.3.4-2.13
glibc-common-2.3.4-2.13
glibc-kernheaders-2.4-9.1.98.EL
glibc-2.3.4-2.13
glibc-headers-2.3.4-2.13
According to Synaptic, if I do a search for 'ld-linux.so.2', it finds it in glibc, have you tried removing it and doing a re-install? If you want to get that file on it's own you could download an rpm from
http://rpm.pbone.net, do a quick search for the file name and you'll see it.