First the PS3, now this. Microsoft is warning that their oft delayed, Windows Vista operating system might be delayed even further in Europe due to "unclear antitrust guidance" from the European Commission. Apparently this all began in a letter from the commission to Steve Ballmer in March with concerns that some of the features in Vista would breach the same laws XP violated a few years back. According to Microsoft, they proposed some changes but never heard back, saying "Once we receive the commission's response, we will know whether the commission is seeking additional product design changes that would result in delay in Europe." Tit for tat, a spokesman for the commission's antitrust division said Microsoft's statement was "misleading to imply that the commission could be the cause of delays. It is not up to us to tell Microsoft what it has to do to Vista, the onus is on Microsoft to design its product in conformity with European competition laws, which it is well aware of." Meow! So is this just legal posturing by Microsoft in their never-ending European antirust battle or a bit of preemptive blame-shifting in case of further delay? We don't know. But hey, Europe, consider yourselves warned.