We use an addon to show the number of new posts as a red number. I think it works well, as you can just go there and get all the updates since your last visit. However some users only visit once a month so that counter is in the hundreds and too much to read. Apart from the user knowing to mark all forums as read, how do other people deal with this? Does anyone has a system that automatically clears the new posts and marks them read after say 2 months on not being logged in?