Jakub, I found the following on the RedHat site that describes the lifespan of each RHEL product... http://www.redhat.com/security/updates/errata/ >From that I would deduce the RHEL 5 is unlikely before 2007. The problem with companies like Accelrys is that they are fixated on supporting RHEL as the os and likely won't budge on this until RHEL 5 forces them to. Argh. Jack