Microsoft today attempted to exorcize the interoperability bogeymen that have haunted it since it was first discovered to be using secret APIs 20 years ago, bogeymen that now quote European antitrust law at it and carry writs from the Court of First Instance in Luxembourg. To avoid further confrontation with the European Commission, which opened a broad investigation of Microsoft's interoperability last month, the company said it would voluntarily open up all the APIs and communications protocols in its biggest revenue producers now and forever. To be clear, it said that these are the APIs and protocols 'used by other Microsoft products.'