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Upgrading a Drupal site is like swimming in shark-infested waters. If you don't have all your ducks in a row, you'll probably lose your ducks. If you're running a vanilla Drupal site, upgrading will most likely work without a hitch. But if you're like most of us who wanted more than just another Blue-Marine-themed Drupal site, well, this quacks for you.
p>So why would you want to upgrade? With every release comes new features, security updates, and usually performance and usability enhancements.