My IT dept doesn't support exchange sync on the iphone yet, and I had tried everything imaginable - but I couldn't get it to work. My brother-in-law recommended synchronica (www.synchronica.com). I'm not totally sure I understand how it works, but basically - it checks your exchange mail, and you set your iphone to sync to it's server (instead of your own exchange server) and then somehow, all your email (and folders) are completely synced! They have a free 60 day trial. Hope this helps someone!