The old forums will be "frozen" in time (archived) and all links within them should still work.... but you won't be able to log on to it or access your account through it, so it's not likely you will be able to access your personal posts in one place like you can now.
Find them now and save them as a "Webpage, complete (*htm, *html)" on your computer. This is easy with IE but not so much with Chrome, etc.