I successfully configured it for the company I work for. All of the detailed steps are out on the net by searching Google, but here are the broad strokes:
1. Enable Exchange Activesync in Exchange System Manager.
2. Install an encryption certificate (easiest way is to install Windows Certificate Services) and configure Exchange virtual server to use it and require an SSL connection.
3. Install certificate on handheld (KB841060)
4. Configure handheld to access Exchange server over Activesync.
Best site to see is:
http://www.petri.co.il/adding_root_c...e_2003_ppc.htm