What defines if it's been updated? Do you mean the user hasn't read it? Or that it was changed since they were last online? Or since they last read the thread? Or ??? I think you'd have to write some code based on your definition of 'updated' to figure out if it's been updated. (And forum_new and forum_old has to do with whether there is an unread post in any of the 'below' forums, it isn't thread specific.)
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