It turns out that Dean’s Permalinks Migration plugin stopped working after WordPress 2.7 (i assume at least, i didn’t do any research about it). You use Dean’s Permalinks Migration plugin to do a 301 (SEO friendly) redirect from your old permalink structure to a new one.

I used /year/month/day/post-title before but i wanted to change to just /post-title and Dean’s Permalinks Migration plugin worked great. But as i said before it stopped worked after we installed WordPress 2.7.

The solution i found was to install another plugin called Redirection that is used to do all sort of redirects in WordPress. After i installed the plugin i just added a regular expression redirect like this.

This means something like redirect any url that looks like /digits/digits/digits/text to /text. The $4 means to grab the text from the last * in the source URL.