PC Advisor's sister title Infoworld US says Dell has confirmed that it will sell and support Windows XP beyond Microsoft's June 30 sales cut-off date.

Dell will take advantage of a licensing option in Vista Business and Vista Ultimate that lets PC makers provide XP under the Vista licence, which Microsoft calls a 'downgrade' licence. In essence, the user is buying a Vista licence that it can apply to XP, and Microsoft can still claim a Vista sale.

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Dell will preinstall XP Professional as a 'downgrade' on a variety of desktop PCs and laptops, a spokesperson said, saving users the hassle of doing it themselves. The computers available with the XP option will include the Windows Vista installation DVD in the box so users can later install Vista over XP under the same licence if they wish.

The 'downgrade' programme is available as an option on some Dell Latitude, OptiPlex, and Dell Precision systems at no charge. It's also available as an option on some Vostro and Dell XPS gaming systems for a small fee; these systems are targeted mainly at small business users and consumers.

A Dell spokesperson said this programme will be supported as long as Microsoft supports the 'downgrade' programme.

Although Dell will ship a resource DVD that includes XP and Vista drivers for included peripherals, it's unclear whether Dell will ship XP drivers for all the available options. For example, a Vostro 200 desktop today available with a choice of Windows XP and Windows Vista has an option for a wireless card that will not work under XP.