Just as an FYI - prefixing the names with an * or ~ did not prevent the mailbox from being available through the Name auto-attendant. For the handful of mailboxes that I wanted to "hide", I ended up putting the letters XYZ in front of the name (for example: XYZ JONES, JOE).
I thought about prefixing the name with XXX, but thought someone might get the wrong idea....... ;-)
Susan
Under certain circumstances, profanity provides a relief denied even to prayer. - Mark Twain