Hello, The Scientific Linux development team has put out a roadmap for the future of Scientific Linux 4. http://www.scientificlinux.org/distributions/roadmap Scientific Linux 4 is going to follow the same type of roadmap that we followed for Scientific Linux 3. SL 4.9 will be a "legacy" release. It will be supported until the time that RedHat no longer supports RHEL 4, which is February 2012. This release will only get minimal support, security updates only. Red Hat calles this "Production 3 Life Cycle Phase" which is "During Production 3, at a minimum, qualified security errata of important or critical impact and selected mission critical bug fixes may be released independent of minor releases. No new functionality, new hardware enablement or updated installation images are planned for release in Production 3 life cycle phase. There are no minor releases planned during this phase." https://www.redhat.com/security/updates/errata/ SL 4.0-4.8 will be obsoleted. Currently that is set to October 10, 2010. That date is flexible. We want to give users at least 6 months to update to SL 4.9. So if SL 4.9 takes too long to be released, we will move the October date back. Summary: SL 4.0-4.8 : Obsolete in October 2010 SL 4.9 : Minimal support (security only) until February 2012 Thank You Scientific Linux Development Team -- __________________________________________________ Troy Dawson [log in to unmask] (630)840-6468 Fermilab ComputingDivision/LSCS/CSI/USS Group __________________________________________________