Hyphen vs. Underscore

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This is related to the hyphen vs. underscore discussions that have been
around the web recently.

Hyphens are better -- but what if you have a site that has been done in
underscores and has several hundred pages indexed in the search engines
(but is not getting the top rankings that it needs).

Is it better to leave the pages with underscores?  Or re-do all the URLs
in hyphens and use 301 redirects?  Or is there a better solution?

Any recommendations on the best way to do this?  It would be terrible to
change them all and have all the pages disappear from the index
completely.  The pages are currently not ranking, but if all the pages
suddenly disappear from the index it would look like a step in the wrong

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