After initially dragging their feet and trying to weasel their way out of the EC antitrust decision from 2004, Microsoft eventually came to their senses and started complying with European law. As a result of Microsoft's improved behaviour, the EC is ending its full-time monitoring of Microsoft.
The Windows Media Player part of the case was a huge failure, but not because the laws are or were wrong. This new development shows that the laws, when applied properly, have a positive effect.
It should be noted that this does not affect the current EC investigation of Microsoft's behaviour in the browser market, and there is still a lot of work to do in order to find the right solution. But it is clear that government intervention has been necessary from time to time, especially when Microsoft actually admit it themselves.