In the first quarter of 2000, Apple and Dell were in a head-to-head battle for dominance in the US education market. Since then, Dell has increased its market share from 22.6% to 34.9% while Apple's market share has fallen from 20.2% to 12.4% in the fourth quarter of 2001, reports MacCentral. The figures come from market research firm, International Data Corp. (IDC).