Is it enough?
Microsoft seems to have to main objectives from this move. The first, and most immediate, is to be able to launch Windows 7 in Europe at the same time as the rest of the world, without having the EC on its case.
It concluded that the best way of going about this is to remove the offending bundled browser and let OEMs or consumers decide for themselves which browser to use.
The second objective is to influence the EC's final decision on this matter and demonstrate it has seen the error of its ways. Microsoft will be hoping this measure at least mitigates any punishment the EC might have planned and might even lead it to conclude there is no longer a case to answer.
The latter eventuality seems unlikely, however, as the scope of the EC investigation reaches back to 1996. Even if it's satisfied that Microsoft is not currently abusing its market dominance, it would be surprising if the EC didn't fine Microsoft for the years in which it did bundle IE with Windows.