iPhone iCal iCloud and lack of confidentiality

Today by way of a practice run I used Siri to make an appointment with someone next Tuesday (call her Blondie). The appointment was entered automatically in my calendar. I then asked Siri to cancel the appointment. Shortly after that I received an email from Blondie with subject heading RE:

Re: iPhone iCal iCloud and lack of confidentiality

Michael, Is your concern that it sent out the email saying it was cancelled, or that all of your iCal entries were visible? All of your iCal entries are NOT sent to the other person, what happens is that is an iCal file containing only the meeting you are talking about, which you double

Re: iPhone iCal iCloud and lack of confidentiality

Hi Michael, Chapter 4: SIRI Page 38 in ‘iPhone User Guide for iOS5 Software’: Siri knows which app you’re using, so you can refer to what’s on your screen. For example, when reading a message in Mail, you can say “Reply, I like it” or “Call him.” Siri also understands different ways of saying