Hello everybody!!

I'm new on linux machine configuration, and I have a question related to product versions.
We've Linux seweb1 2.6.9-5.EL installed, but instead of install the mysql product from "Red Hat Interprise Linux 4" CD what is mysql-0:4.1.7-4.RHEL4.1.i386, we installed:  mysql 14.12 5.0.24a
So, now, when we tried to install dovecot, it needs mysql-0:4.1.7-4.RHEL4.1.i386, perl-DBD-MySQL-0:2.9004-3.1.i386 and postgresql-libs-0:74.6-1.RHEL4.2.i386.
I don't want to install these packets from mysql because I'm afraid to crash the mysql that we've now working......
So, my question is, what I need to do in this case?

Can I install the mysql CD version without interferring to our actual BD working: mysql 14.12 5.0.24a?
Or....Which version of dovecot we must install in order to work with mysql 14.12 5.0.24a.

I would be very gratefully if you could help me, beacause we afraid to crash the BD that is working now, and we don't know how to install dovecot in this case.

Best regards,

Maria