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Microsoft Needs To Go Nimble After Vista: Page 3 of 3

Even the vast library of legacy applications, the ones which Microsoft has worked more than a decade to support in each new version of Windows, may not be enough to keep Windows in the catbird seat.

"It would be a lot harder for Microsoft [to abandon old applications] than it was for Apple," says Silver. In 2001, Apple debuted the client version of Mac OS X, which de-emphasized backward compatibility in applications.

"But at some point Microsoft might be forced into it."