I would like knew a haunting query regarding URL Redirecting & URL Rewriting.
I have a website 10 years old which did not follow any of the SEO guidelines. The pages PR is 3. I started Optimizing pages one by one. Majorly all the subpages were constructed with underscores like www.example.com/make_sense.php (the pr is 3)
My Query is can redirect all these type of urls like www.example.com/make-sense.php (with hypen using 301 redirect)
or Is it wise to send the old
(www.example.com/make_sense.php)urls to 404 error page by simply rewriting it www.example.com/make-sense.php
Does it effect the page rank?
Please Suggest. Masters of Web