This is nice, but it won't let you install it requires the Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 install. Unfortunately, you can't install this if you're running any version of Outlook on the machine. Almost had it. Guess it's back to Remote Desktop sessions into the Exchange 2003 server for me.
As a system / network administrator of Windows Server 2003 and Exchange 2003 for a small area, this has been one headache for me about deciding to implement a Vista machine for my office use. Difficult to get the client management installations of server applications to install and run. Yes, I can go into a remote session, but sometimes, it's just easier to open a direct app on your personal desktop to manage the same functionality.