Hi Jennifer
Thanks for your thoughts. As I said this is a 50,000 post forum so I definitely won't be adding 301s for all of them.
I think this is what we'll do:
- Use OSE and the google 'site:' operator to identify the most valuable posts in the forum and 301 redirect them to the the new URL for that post
- set up a general 301 redirect to redirect all other URLs to the forum homepage '/forum/'
If anyone has any other thoughts, I'd love to hear them!
J