Monopoly power
Monopoly power
QuickBooks and TurboTax are near monopolies, with a retail market share of more than 90%, according to NPD Group, a market research firm. Microsoft is probably Intuit's highest- profile corporate victim, having tried and failed to take on QuickBooks with Small Business Accounting, a rival bookkeeping app.

This story is from the April 9, 2012 issue of Fortune.
By Richard McGill Murphy, contributor @FortuneMagazine - Last updated April 05 2012: 6:45 AM ET
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