From Joomla! Documentation

This page is a translated version of the page Category:Migration and the translation is 100% complete.

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Migration is required when moving between major versions of Joomla!, such as moving from 1.5 version to the 3.x version. Some migrations are more involved, such as 1.5 to 3.x. Others are considered a mini-migration, such as 2.5 to 3.x.