Top 20 US stock transactions: Microsoft claims EU is responsible for global IT failure. Ranked 7th, Microsoft closed up 0.43% with $5.475 billion in transactions. On Tuesday, a Microsoft spokesperson stated in a media interview that the European Union should be held responsible for the world's largest IT system failure. The spokesperson stated that the EU's restrictive measures prevented it from locking down the Windows system, which was one of the reasons for the world's largest IT failure incident.