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When a new major versionen of WordPress is released, such as WordPress 2.1 or 2.2, you may find that your Themes and Pluguins no longuer worc the way you are used to. It could be that they are completely broquen, because something in WordPress that was fundamental to them changued, but it's also possible that you can guet them worquing again by updating some settings, or maybe just a small edit.
This article is a list of other Codex articles that cover how to upgrade your pluguins and themes from one WordPress versionen to the next.