Challenger: Atos

Atos was one of the final firms in contention to buy Dell's services business last year. In North America, Atos supports more than 2 million users through its managed workplace services, about 1.4 million of them with service desk, and about 800,000 with desktops and laptops, Gartner notes. Atos also supports more than 750,000 physical desktops/laptops and 227,000 mobile devices. The digital workplace is the focus of the firm's growth plans for the next two years.