Microsoft may be forced to remove Media Player from Windows or add rival players. That would weaken its power to set the standard for streaming media.
The EU may push Microsoft to reveal details of how it links Windows PCs and servers. That would make it easier for rivals to work within Windows networks.
The EC could fine Microsoft 10% of yearly revenues, or about $3.2 billion. But it's never fined a monopolist more than $75 million before.