Microsoft Corporation is the world's leader in the design, development and marketing of operating systems and software programs for PC's and servers. The group also builds and sells computer equipment. Net sales break down by activity as follows: - sale of operating systems and application development tools (42.9%): primarily for servers (Azure, SQL Server, Windows Server, Visual Studio, System Center, GitHub, etc.) and (Windows); - development of cloud-based software applications (37.7%): programs for productivity (Microsoft 365; Word, Excel, PowerPoint, Outlook, OneNote, Publisher and Access), integrated management and customer relationship management (Dynamics 365), online file sharing and management (OneDrive), and unified and collaborative communications (Microsoft Teams); - other (19.4%): primarily sale of software licenses (Windows), tablets (Microsoft Surface), video game consoles and software (Xbox), computer accessories, etc. The United States accounts for 51.3% of net sales.