People of course can disagree about what is "reasonable." I personally don't consider my e-mail private, not when a Google engineer has been caught stalking people through their GChats (http://gawker.com/5637234/gcreep-google-engineer-stalked-tee...), and not when the whole business model is built on reading through those e-mails to serve advertisements. I consider that quite different than my cleaning lady incidentally having access to documents in my desk drawer.