ryanshoover

Changing your link structure in WordPress can lead to all of your old links breaking and returning a “404”. But no more! If someone goes to an old link for your site, I’ll find the new link and redirect them there automatically.
No configuration. No one-by-one setting of the new link structures. No wrestling with complicated regex patterns. Just install me and relax.
Redirect 404s works with posts, pages, and custom post types (like ecommerce products).
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<li>Note – the plugin only works for permalink structures where the last “chunk” of the URL is the post name (also called the slug).</li>
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Redirect Old Links

Did you change your permalink structure and now have old links "404ing"? I'll redirect those old links to their new one for you.

microkid

If you just migrated your WordPress blog from one permalink structure to another, and you don’t want to lose Pagerank or traffic that accesses your blog through the old permalinks, this is for you.
Right before the old permalink generates a 404, this simple plugin grabs the slug from the end of the request and checks if there’s a post with this slug living somewhere else on your blog. If so, it will generate a “301 Moved Permanently” error, which automatically forwards your visitor (and Googlebot) to the new location of your post. It’s simple, but effective. No configuration options, just plug and play.
<h3>Support</h3>
This plugin is in active development. All feedback is welcome on <a href="http://www.microkid.net/wordpress/permalinks-moved-permanently/" title="Wordpress plugin: Permalinks Moved Permanently" rel="nofollow ugc">the plugins homepage</a>.

Permalinks Moved Permanently

If you just migrated your Wordpress blog from one permalink structure to another, and you don't want to lose Pagerank or traffic that accesses yo …

Redirect Old Links vs Permalinks Moved Permanently