How do I manage 404s for old paths?
Is there a best practice for what to do with old broken links?



Redirect as much links as you can to existing pages using URL aliases.
Find out what pages are linking to your website on the old URLs, see if you can get them adjusted by contacting the webmaster (using a backlink indexing tool like Open Site Explorer or Majestic SEO).
For other links you have the HTTP 404 status code. Sometimes you just can't redirect the links...