http://sec.gov/Archives/edgar/data/7890 ... tx73014_12
Competition
Client faces strong competition from well-established companies with differing approaches to the PC market. Competing commercial software products, including variants of Unix, are supplied by competitors such as Apple, Canonical, and Red Hat. Apple takes an integrated approach to the PC experience and has made inroads in share, particularly in the U.S. and in the consumer segment. The Linux operating system, which is also derived from Unix and is available without payment under a General Public License, has gained some acceptance, especially in emerging markets, as competitive pressures lead OEMs to reduce costs and new, lower-price PC form-factors gain adoption. Partners such as Hewlett-Packard and Intel have been actively working with alternative Linux-based operating systems.
The Windows operating system also faces competition from alternative platforms and new devices that may reduce consumer demand for traditional PCs. Competitors such as Apple, Google, Mozilla, and Opera Software Company offer software that competes with the Internet Explorer Web browsing capabilities of Windows products. User and usage volumes on mobile devices are increasing around the world relative to the PC. OEMs have been working to make the Google Android mobile operating system more compatible with small form-factor PCs or netbooks.
Our operating system products compete effectively by delivering innovative software, giving customers choice and flexibility, a familiar, easy-to-use interface, compatibility with a broad range of hardware and software applications, and the largest support network for any operating system.


