Detailed information on how to upgrade your existing Joomla 1.0.x to 1.5 can be found in our Joomla 1.5 tutorial.
Please note that the Joomla upgrade to 1.5 will preserve ONLY the content of your current web site. No custom templates or modifications will be stored. No components, modules or mambots you have installed will be available after the upgrade. You will have to add again all custom components as you did before and only if they are available for the new Joomla version.
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