There are important differences between the Apache HTTP Server 2.2 and version 2.0 (version 2.0 shipped with Red Hat Enterprise Linux 4 and earlier). This section reviews some of the features of Apache HTTP Server 2.2 and outlines important changes. If you are upgrading from version 1.3, you should also read the instructions on migrating from version 1.3 to version 2.0. For instructions on migrating a version 1.3 configuration file to the 2.0 format, refer to Section 21.2.2, “Migrating Apache HTTP Server 1.3 Configuration Files to 2.0”.