Microsoft's ambitions are anything but small. The world's #1 software company develops and sells a variety of products used by consumers and businesses. Its core products are the ubiquitous Windows PC operating system and the Office business productivity application suite that is sold in part through PC makers such as Acer, Dell, Hewlett-Packard, and Toshiba, who pre-install the software on their devices. Microsoft also sells directly online and through resellers. It also makes video game consoles (Xbox), enterprise applications (Microsoft Dynamics), server and storage software, and digital music players (Zune). Other activities include online advertising, mobile software, and consulting and support services.