For most people, what's fantastic about Outlook is it works with the systems provided by the people who pay them a salary.
So use MS Windows & Office at work only, and your employer pays to have their privacy violated. What is the big deal?
If you are doing your own PC then its up to you what you are willing to trade in terms of privacy versus compatibility with office work. Very few home users will be accessing Exchange, and as for calendering then you can get it free (with similar privacy violations) from Google - shared calendars and an email every morning outlining the day ahead, etc.