Zenoss Core 4.2 install failed on CentOS 6.3 64bit

I have followed all of the instructions in the Installation guide.

I've installed fresh CentOS 6.2 64 bit. Updated it to 6.3.

Removed old applications including mysql.

Installed all of the prereqs including downloaded MySQL (client, server, shared) version 5.5.29-1.el6.x86_64.

I've used yum localinstall commands just like in guide.

I get errors when installing zenoss rpm with yum command. Here are the last steps in the error log.

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Error: Package: zenoss-4.2.0-1586.el6.x86_64 (/zenoss-4.2.0.el6.x86_64)

           Requires: mysql-server >= 5.5.13

           Available: mysql-server-5.1.61-4.el6.x86_64 (base)

               mysql-server = 5.1.61-4.el6

           Available: mysql-server-5.1.66-1.el6_3.x86_64 (updates)

               mysql-server = 5.1.66-1.el6_3

           Available: mysql-server-5.1.66-2.el6_3.x86_64 (updates)

               mysql-server = 5.1.66-2.el6_3

Error: Package: zenoss-4.2.0-1586.el6.x86_64 (/zenoss-4.2.0.el6.x86_64)

           Requires: mysql-client >= 5.5.13

Error: Package: zenoss-4.2.0-1586.el6.x86_64 (/zenoss-4.2.0.el6.x86_64)

           Requires: mysql-shared >= 5.5.13

You could try using --skip-broken to work around the problem

** Found 3 pre-existing rpmdb problem(s), 'yum check' output follows:

2:postfix-2.6.6-2.2.el6_1.x86_64 has missing requires of libmysqlclient.so.16()(    64bit)

2:postfix-2.6.6-2.2.el6_1.x86_64 has missing requires of libmysqlclient.so.16(li    bmysqlclient_16)(64bit)

2:postfix-2.6.6-2.2.el6_1.x86_64 has missing requires of mysql-libs

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It feels like yum does not see MySQL installs. I've used yum to install mysql rpms.

Please advise.

Thanks.