update CentOS and ISPConfig configuration

[Jorem]

I use CentOS 4.2 now and I like to do yum update. Can I do this without loosing my ISPConfig configuration?

[till]

Normally this shall work without problems, but its always better to make abackup of your config files in /etc because sometimes rpm will replace e.g. the main.cf file and mail delivery will fail then.