Microsoft's latest 10-K, filed last week, adds Canonical, distributor of Ubuntu Linux, to the list of acknowledged competitors for Microsoft's Client division, which makes Windows for PCs. Also notable is the addition of Linux distributor Red Hat to the list of Client divison rivals. Previously, Red Hat was mentioned only as a competitor for the Microsoft Business and Server & Tools divisions.
Here's what Microsoft says on the subject in the latest filing:
"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."