Mobile OS market shares in 2005: Symbian - 51%, Linux - 23%, Windows - 17%

Symbian had 51% market share of the mobile OS market at the end of 2005, down from 56% in 2004, The Diffusion Group says. Linux came in second at 23%, which was double its 2004 share of 11.3%. Microsoft came in third upping its 2004 market share of 12.6% to 17%. By 2010, Windows will hold the lead at a projected 29%, trailed by Linux at 26% and Symbian at 22%.