I just wanted to share the information to the new users of Zimbra. That Fedora Core 4 is the best OS to go with Zimbra.
Please do a YUM update so that you will have Latest patches and Updates.
The Zimbra installation was with no errors and its working really good.
The good thing about Fedora Core 4 is that it works in both 32Bit Computers and 64 Bit.