Terry posted this in the UK engine thread, and it's been in some other threads.
I think that most people using the internet simply use their system "straight out of the box". What I mean by this is that the installation routine from the ISP usually sets their home page to its own portal page
This may be a fundamental question in determining search habits of the general public. We know, for instance, that MS used this "acceptance by default" to become the dominant browser and to propel MSN.