Please restore all old Knowledge Base articles.
Please restore all old Knowledge Base articles in the new CMS.
There is a lot of Information in these articles and often resolutions to older user's questions simply refer to the appropriate KB article (which is in almost all cases not available). The current policy of uploading a KB article by request takes too long to be helpful in most situations and it might not apply to the problem at hand, so another round of request-upload-review is started.
I understand that you want to build a better knowledge base, but discarding all "old knowledge" is not helpful.