Companies that don´t start Windows 2000 upgrades by the end of the quarter should scrap their plans, a market research company warned on Tuesday.

That´s because upgrading after midyear would mean taking on a long and challenging project, with the clock ticking down on Microsoft´s support for that system. But waiting could be costly, too, as companies knuckle down for several years of running two or more different versions of Windows at the same time.

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