Nearly 100 million PCs are likely to be replaced this year, with 120 million being swapped out in 2005, according to data research firm Gartner released Thursday.

The volume of replacements in the next two years will surpass the number of units replaced in the run-up to Y2K in 1998 and 1999, Gartner said. In 2004, replacement units will drive global shipments to 186.4 million--an increase of 13.6 percent over 2003.

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