Ben Vollmer tilts his lance at this issue I have seen asked many times and in many forums:

"I have only ever seen this to be an issue on one machine Virtual PC demo environments. But you are in Outlook and you want to show customizations, you open the Web Client and no customization area, and sometimes, no Settings area at all. Why you ask?"

After reading his complete response you will know the answer. You will also be able to point others to the answer. Ya gotta luv it.