Seattle - Microsoft's board faces a lawsuit over the way it handled an error with its Internet Explorer browser that ended up costing the company a record-breaking $731 million fine by European antitrust regulators. The lawsuit, brought by shareholder Kim Barovic in federal court in Seattle on Friday, charges that directors and executives, including founder Bill Gates and former chief executive Steve Ballmer, failed to manage the company properly and that the board's investigation was insufficient into how the miscue occurred. The legal action is the first to emerge from a humiliating episode for Microsoft, which the software company has never fully explained and has accounted for only as a "technical error." In March last year, the European Union levied its largest ever antitrust fine against Microsoft for breaking a legally binding commitment made in 2009 to ensure that consumers in Europe had a choice of how they access the internet, rather than defaulting to Microsoft's Internet Explorer browser.