At work we’re upgrading to the latest release of Microsoft Exchange and I needed to change the server address within Outlook. To start with, one cannot change the Microsoft Exchange server from Outlook—the field is read-only.  The solution is to run the Mail control panel applet.  However, Mail tool is only available under the View 32-bit Control Panel on x64 systems (I spent 10 minutes looking for it which prompted me to blog this).

The 32-bit Control Panel has the Mail applet:

To get to Mail Setup: