I just wanted to make a quick post for anyone else who has had a tough time trying to find the "Mail" Control Panel applet on Vista 64. (and I assume this will also apply to other 64 bit Microsoft OSs).
I was setting up access to an exchange server yesterday for Outlook 2007. As you may already know, this needs to be done while Outlook is fully closed and should be set up by using the Mail applet in the Control Panel.
On Vista 64 bit Edition, this icon is no longer present in the Control Panel. Because this applet is a 32 bit applet instead of 64 - it gets hidden away with other 32 applets.
To find the Mail item - you simply need to click on the icon labelled "View 32-bit Control Panel Items" in the Control Panel. If you don't see this entry, you'll need to change the view in the Control Panel to "Classic View". This can be done by clicking the appropriately named link in the top left of the Window.