Financial communication is a new science, which mixes the concepts related to the finance and marketing area. Is this new discipline so necessary in the enterprise's world? Is this subject able to influence and determinate different business performances? Is this communication a fundamental aspect of value creation, leading to an improvement of revenues, a reduction of costs, a huge issuing of company's shares, an enhancing stock price? In this research thesis the relationship between the disclosure with the operational and market results will be examined firstly by analyzing a case study of firms involved in a circumstance of mergers and acquisitions and secondly by trying to identify positive or negative correlations between financial communication and performances. The work, which is structured through a deep analysis of financial disclosure interactions and implications in the Microsoft--Skype acquisition case happened in 2011, evidences congruencies with qualitative and operational results, while the outcomes of the market analysis are fluctuating.