Last week it was Symantec complaining about Vista's limiting access to the new Microsoft kernel. This week, McAfee chimed in with similar complaints. eWeek thinks there may be a formal antitrust action in the works.

"With rivals' complaints over Microsoft's move into the security applications space growing louder nearly every day, antitrust analysts said it appears likely that the software giant may soon again be locked in a battle to defend its business practices to government regulators."