Indian IT firm Tata Consultancy Services (TCS) has overtaken outsourcing and consultancy giant Accenture, which has a market capitalisation of $98 billion. TCS ended the last fiscal with a revenue of $19.09 billion, which is less than half of the NYSE-listed Accenture's yearly revenue of $34.9 billion. TCS on Monday became India's first $100 billion company in a decade.