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The other thing to remember is the RHEL/Centos usually does not change the major revision number of most software. Instead it back patches the version it is using to contain the security level of current versions. This is done to maintain a maximum compatibility and stability profile for the system. An easy example of this is the kernel. RHEL/Centos5 started with a 2.6.18 kernel and the last version 5.7(or however high they go) will also have a 2.6.18 based kernel. However the current kernel (2.6.18-128.4.1.el5) is probably closer to a vanilla .26 kernel than it is to a vanilla .18 kernel.