Look here for a list of things that are new in the 4.1 versions of MySQL. If you don't need/use/want any of these features, then there is no reason to upgrade. A few additions are really nice, such as subqueries and the INSERT ... ON DUPLICATE KEY UPDATE syntax.jw00dy said:Just a question, but why upgrade from the 4.0.x versions to 4.1.x version? Just wondering if their are advantages or not?