http://www.microsoft.com/
Microsoft provides a powerful, expanding, and widely accepted set of applications and platform technologies that are generally established as a functional requirement for professionals who work in architecture, engineering, and construction (AEC).
Bentley is a leading provider of software for the lifecycle of the world’s infrastructure. Bentley's advanced solutions are used to design and manage airports, buildings, factories, power and process plants, roads, bridges, railways, communications networks, utility systems, water treatment and distribution facilities, and much more.
Bentley’s solutions are built exclusively on Microsoft Windows and include some products that connect to and extend capabilities in Microsoft Office SharePoint. In this way, Bentley’s comprehensive portfolio works in concert with Microsoft products and technologies to meet the challenging collaborative needs of infrastructure professionals.