The plot thickens -- see the full post for more context-setting
Microsoft says it is reviewing the EU's decision but notes that the European Commission (EC) said in October that Microsoft "was in full compliance with the 2004 decision, so these fines are about past issues that have been resolved." The EU's continued belligerence--EU regulators publicly mocked Microsoft's documentation publication and interoperability announcement last week before even reviewing what the company had done--is somewhat unsettling.
Even more unsettling, for Microsoft, is that the 2004 antitrust ruling is just one of three separate antitrust actions that the EU is considering against the company. It is separately conducting two other antitrust investigations against the company, involving product tying and Office document interoperability. Not coincidentally, Microsoft's interoperability announcement last week completely addresses the second of those two concerns. Given the EU's behavior with regards to Microsoft lately, however, it's unclear whether they'll see it that way.