You're right. His complaint, on the other hand, is that although you can use whatever "word processor" you want, you know that at the other end Microsoft will h

You're right. His complaint, on the other hand, is that although you can use whatever "word processor" you want, you know that at the other end Microsoft will have full access when your colleague reads the document in Word. Substitute "word processor", Microsoft, and Word with email client, Google, and Gmail as appropriate.