On a high level you do this:
1) Create the iOS configuration policy. The actual Exchange part is quite self-explanatory
2) Link the new policy to a device group (use "all device" if you don't have a group already or create a new group)
3) Send "Apply Policy" command to group or enroll a new device into the group
Done :-)
You can find more information in the Afaria documentation (Afaria_AdministrationReference.pdf)
Peter