Microsoft is the worldwide leading manufacturer of PC software. The company offers a broad spectrum of products and services. Microsoft's product portfolio spans from operating systems for PCs and networks, over server software for client-server environments, user programs and desktop applications for companies and private users, and multimedia applications to internet platforms and developer tools. Moreover, Microsoft offers online services, computer literature (MS Press), and input devices.

Founded in 1993, Red Hat is the premier Linux and open source provider. Rated the number one enterprise software vendor for value in a CIO Insight Magazine study for four consecutive years, Red Hat is the most recognized Linux brand in the world. Red Hat serves global enterprises through technology and services made possible by the open source model. Solutions include Red Hat Enterprise Linux, middleware, and a broad range of management and services: consulting, 24x7 support, Red Hat Network. Red Hat's global training program operates worldwide and features RHCE, the global standard Linux certification.

Parallels is a worldwide leader in virtualization and automation software that optimizes computing for consumers, businesses, and service providers across all major hardware, operating system, and virtualization platforms. Founded in 1999, Parallels is a fast-growing company with 900 employees in North America, Europe, and Asia.
PlusServer uses the Parallels product Plesk on its servers. Plesk is a comprehensive control panel, which offers highest quality, proven technology, broad functionality, and qualified support. It simplifies the management and administration of web sites by automating many tasks.

T-Systems is the business customer brand of Deutsche Telekom. As one of only a few service providers worldwide, T-Systems offers with its 56,500 employees integrated ICT solutions from one source. Those can be obtained by the customers as Dynamic Services, i.e. according to their current requirements. For this purpose, they rent software, hardware, processing power and disk space as well as telecommunication services directly from the net. That way, customers can react quickly to new market demands. With T-Systems as a partner, companies can focus on their core business, optimize processes, and reduce costs.

Level 3 is an international supplier of communication services and runs one of the world's largest internet backbones. The company offers an extensive service portfolio with its 120,000 km long fiber glass network, e.g. services based on the internet protocol (IP), broadband and infrastructure services, collocations, voice services, and VoIP. Those services form modules, which allow other carriers, cable companies, mobile phone companies, internet service providers, and other major customers to meet the rising demands on highly developed communications solutions.

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