Opera was involved in a years-long feud with Microsoft dating back to 2001.[66] On at least three occasions, Opera accused Microsoft of deliberately breaking interoperability of its MSN services and the Opera browser or other non-Internet Explorer browsers.[66][67] Microsoft denied that it was intentionally shutting out Opera users.[66][67] In response, Opera released the "Bork Edition" of its web browser, causing MSN to display only the phrase, "Bork, bork, bork!" which was popularized by The Muppet Show character, Swedish Chef.[68][69][70][71] In 2004, Opera received a confidential $12.75 million payment from an "international corporation" reported to be Microsoft.[67]