This question already has an answer here:
I have a blog with around 40 posts, and i want to change the URL structure these posts. this is my old URL something like:
i want to set the URL like:
Now the concern is recently i have get the PR to my site after a long struggle ;)
i am using wordpress for my blog, and will do url rewriting easily,
i just want to know should i have to use 301 permanent redirection so that i will not get the 404 page not found error for my old pages??