Over time, the way Drupal builds various paths has changed. If you are upgrading from an older version of Drupal, you will still receive requests from the Internet for these old paths. The Legacy module's job is to recognize these paths and redirect them to the correct version. The following mappings are taken into consideration:
• taxonomy/page/or/52,97 to taxonomy/term/52+97
• taxonomy/feed/or/52,97 to taxonomy/term/52+97/0/feed
If you started out using a recent version of Drupal (4.6 or later), you don't need to use the Legacy module, and you can leave it disabled.
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