How can I create a folder structure in a discussion board? I have already tried this solution:
1) Create a new Site Content Type say called 'Thread Folder' based on the Folder Content Type with the Parent Content Type as a Discussion (Site Actions -> Site Settings -> Site Content Types)
2) Then, go into the Discussion List Settings and add the new content type (Add from existing site content types)
Then I create a new 'Thread Folder' and discussion in it. When click on Reply within this discussion, I cannot see item that represent root reply. How to get rid of this problem?