Take a look you incoming mail; you will see a header containing the following: an upside down debian icon (your thread icon), a paper clip, Subject, Sender, Recycle, and date. Just click on the icon that looks like an upside down debian icon, that should do it.
Hope this helps,
Oh, take a look at you View->Sort By and make sure un Threaded is selected.
Last edited by revenge80200; 08-29-2006 at 05:37 PM.