I think the reason google doesn't run a robot that say's it is Internet Explorer is part of their don't be evil policy. They say that their spider is going to have a specified user agent, and will grab robot.txt - if they didn't do that they would be going against their policy.
Slashdot Mirror
I think the reason google doesn't run a robot that say's it is Internet Explorer is part of their don't be evil policy. They say that their spider is going to have a specified user agent, and will grab robot.txt - if they didn't do that they would be going against their policy.