I don't think many home users are using Outlook.
I don’t think she was alone - I’d bet a ridiculous number of $300 netbooks have a $100 Windows OS and $200 MS Office Suite installed on top.
It's very much an enterprise / business thing for the most part.
I don't think this distinction affects the grandparent comment's point.
Most computer illiterate people I know have always used hotmail or yahoo mail (slowly changing to gmail) rather than setting up pop3 or imap access to a mail server....