It's not just Red Hat.
http://www.internetnews.com/dev-news/article.php/3592671
,----[ Title: Dell Delivers Novell's Linux Zen ]
| Red Hat currently represent 65 percent to 70 percent of Dell's Linux
| business, though Novell is improving quickly. Dell has a partnership
| in Asia with Asianux, and Chavis noted that Dell is aware of many
| Debian and Mandriva Linux users on Dell hardware.
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