The_Unbeliever
Honorary Master
Is intergration not one of the big things that the new Ubunto is trying to do?
The difference between Ubuntu/insert your fave distro here/etc and Windows is that IE is tied into the operating system, you cannot remove it without breaking something in the process. And there is always something which will be dependant upon the presence of IE.
With Ubuntu/etc you can use whichever web browser you want to without it breaking anything.
Plus, the way IE is integrated into Windows makes it a prime target for infestation.