In the software development cycle, a release candidate is a release that could potentially be a final product. A release candidate can be used for production sites, but it is still possible that changes could be made prior to the general release.
For the time being the Joomla! 1.0.x release will continue to be supported and updated if security or other major issues arise. Eventually, support for the 1.0.x will cease, but this will not be in the near future.
Instructions for installation can be found here. http://help.joomla.org/content/section/48/302/
You can migrate a Joomla! 1.0.x site or a Mambo 4.5.x to Joomla! 1.5.
Joomla 1.5 does not provide an upgrade path from earlier versions. Converting an older site to a Joomla 1.5 site requires creation of a new empty site using Joomla 1.5 and then populating the new site with the content from the old site. This migration of content is not a one-to-one process and involves conversions and modifications to the content dump.
There are two ways to perform the migration:
This is a two phased process using two tools. The first tool is a migrator component named 'com_migrator'. This component has been contributed by Harald Baer and is based on his 'eBackup' component. The migrator needs to be installed on the old site and when activated it prepares the required export dump of the old site's data. The second tool is built into the Joomla 1.5 installation process. The exported content dump is loaded to the new site and all conversions and modification are performed 'on-the-fly'.
Step 1 - Using com_migrator to export data from old site:
Step 2 - Using the migration facility to import and convert data during Joomla 1.5 installation:
Note: This function requires use of the iconv function in PHP to convert encodings. If iconv is not found a warning will be provided.
This is now defined in the language .xml file in the language metadata settings. If you are having locale problems (dates don't appear in your language) you might want to check/edit the entries in the locale tag. Note that multiple locale strings can be set and the host will usually accept the first one recognised.
The improved installer can be found under the extensions option. With versions prior to 1.5 you needed to select a specific extensions type when you wanted to install it, with Joomla! 1.5 you just select the extension you want to upload, and click on install. The installer will do all the hard work for you.
This is now implemented by inserting a tag (button is in the editor area) a dotted line appears in the edited text showing the split location for the "Read more...". A new bot takes care of the rest.
It is worth mentioning that this does not have a negative effect on migrated data from older sites. The new implementation is fully backward compatible.
Mambots have been renamed as "Plugins" Mambots were introduced in Mambo and offered possibilities to add plugin logic to your site to mainly for the purpose of manipulating content. In Joomla!, Plugins will now have much broader capabilities than Mambots. Plugins are able to extend functionality at the framework layer as well.