http://www.sec.gov/Archives/edgar/da...58735/d10k.htm
"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. "