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According to Lehman Bros., some 500 million PCs are too old to run Microsoft's Windows XP. Microsoft will no longer offer technical support for Windows versions 3.1, 3.11 and 95 after Tuesday. Windows 98 and Windows NT versions up through NT4.x won't be supported after June 30. In addition, equipment purchased from 1997 to 1999 is fully amortized, meaning the initial costs have been recaptured on the books.