Groklaw has an interview with the FSFE's counsel Carlo Piana. This interview comes on the heels of the Microsoft antitrust penalty hearings in Brussels last Friday.

But what concerns us most is that you need to control the end-user license so the end-user license shouldn't be the GNU GPL. So that's the main problem with the conditions. They [Microsoft] want that our implementation, the Free Software implementation of their information, which is a separate product developed by, independently by other companies, would be forced to be licensed under non-Free Software, non-copyleft conditions. That's plainly unacceptable, because the only real competition now is under the GNU GPL.

Thanks to Sean Daly for the link to his interview.