Microsoft isn't doing some clever targeting with this. It's pretty obvious that they're going after ignorant people with an ignorant tactic, and let's face it, they couldn't attract users any other way.
Targeting smart people is seldom a smart strategy - they are not as numerous.
Bundling makes a lot of sense because they can deal with ten, at most, clients and have a huge impact on just about every computer user on the planet. Groklaw has an interesting piece on the probable reasons why Asus pulled the plug on their ARM-based netbook and I guess this is their typical behaviour.
Want to bet the net MSN Live Messenger (or, will they call it "Bing messenger"?) will make every search on the system default to Bing?
Playing fair is so strange to their corporate DNA it would provoke a violent allergic reaction.
I won't let them ruin my day.