Upgrading a version 1.3 SP to the newer release is not automated or seamless, but the new release is completely compatible with the older releases functionally. In other words, while the configuration is somewhat different (very different in some spots), much of it is similar, and it is always possible to configure the new software to behave functionally the same as the old software, so you do not have to change applications unless you want to take advantage of new features or improvements.
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Mechanics of Upgrading
The actual update process is platform-specific, but at this point, all of the supported packaging techniques include protection of configuration files across uninstalls or updates. Most platforms (e.g. Windows) require a full uninstall/removal followed by a reinstallation of the new software. Others (e.g. RPMs) can be upgraded in place followed by a manual conversion of your configuration details.
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