[hughesjr]

I suggest you start with the initial thread:
http://www.zimbra.com/forums/install...-6-failed.html

I did read it .. you yourself say that you did not have this problem on CentOS-4.6. When you did the install, it worked fine.

In fact, I do a little more research and I see this:

#27598: XS version error from Compress:Zlib

What I see here is CentOS-4.6 works exactly like RHEL-4.6 ... how am I worng?