On 08/05/2010 10:24 AM, Kwan Lowe wrote: > Has anyone ever tried to mass replace installed RedHat RPMS with their > equivalent CentOS versions or vice versa? > I've seen posts that RHEL -> CentOS is at least possible. That is, > take a RHEL system and get it to update via YUM and CentOS > repositories. I have not seen the reverse, however. Check this out, it will point you in the right direction: http://blog.famillecollet.com/post/2010/04/15/Switch-from-CentOS-5.4-to-RHEL-5.5 Tom