Quote Originally Posted by tonyfoale View Post
Accidental duplicate post. Can't delete but can edit it. I guess that the people who write forum software do not use forums.
Numerous fora have experienced the situation where one of their more prolific members becomes disgruntled over something and deletes all his posts before leaving the forum, thus denying future members from whatever useful plans/ideas/methods/etc. he may have presented.

To forestall this sort of behavior, many fora have made it impossible to delete a post. Often the period when one can edit a post is kept short for similar reasons.