The 800-pound gorilla in the SBC space is Citrix, which owns close to 75 percent of the virtual user interface software market, according to IDC (a sister company to CIO's publisher). Citrix was founded in 1989 by a group of IBM developers who had worked on OS/2. Their goal was to let multiple users gain access to the operating system from multiple devices, mainly Unix servers. When the Internet started to take off in the mid-1990s, however, CIOs started deploying Citrix software to secure access for their mobile users and to provide a greater degree of application centralisation.
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Source: cio-asia.com