Sjors Gielen wrote:
If you meant, why should they be deleted instead of kept for reference; there could be an archive, but currently they are deleted, afaik.
Why don't you just save an outdated: true/false information? Those posts could just be not displayed by default, but if someone ever needs one of those, he could just click the magical "Show all"-button. And for the admins/maintainers just a per post "mark outdated"/"mark relevant" link.