Stay with default permalinks only for posts

Hello,
I want to continue to use my blog with the default permalinks as example.com/blog/?p=123 but the pages will be at example.com/page-name, any idea?

I use IIS the permalinks work without problem. I only need to redirect them from the old ones to the new permalinks. The problem is that wordpress 3.4 have bug with the redirect http://core.trac.wordpress.org/ticket/21020 There is any fix to it? if yes, How I do it?