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America Online
America Online
Case at the AOL Time Warner merger press conference in 2000.
Loss: $219 billion
Peak market cap: $222 billion (December 1999)
Recent market cap: $3 billion
Ticker: AOL

Under founder Steve Case, AOL built a formidable user base and became synonymous with the consumer Internet. But Case (right) and Time Warner's Gerald Levin agreed in January 2000 to a merger that would soon be judged among the worst ever, with the combined company racking up $99 billion in losses in a single year. AOL has since freed itself from Fortune and CNNMoney.com parent Time Warner, but the once ubiquitous "you've got mail" tagline now elicits shrugs.

NEXT: Exxon Mobil
Last updated February 05 2010: 2:57 PM ET
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