SS Old URLs allows you to add URL redirects through the WP admin for old content URLs.
For example, if your old site had its about page at /about.html, but your new WordPress site uses a nice URL like /about/, you can add the rule /about.html ==> /about/. This will preserve any existing links to the old URL. In addition, we perform our redirects as “301” redirects so you should maintain as much “Google Juice” as possible.
This plugin is especially useful for developers and designers who are porting older websites to WordPress. You can also use it if your move pages around or change URLs/slugs for any reason.