I unfortunately don't agree with this. I went back to look at posts from when I was first on the site about 4 years ago and they are gone. We had some good times then..sad that I don't get to remember them.
@HayHo: I made a mistake with the forums, and deleted the database a while ago...that shouldn't happen again. Nothing is being automatically deleted with this new feature...you only have the option to delete your own posts (one-by-one) if you need to.