Microsoft will deliver the first preview version of Windows XP by early July, but early adopters could find that their PCs lack enough memory and processor speed to run the new operating system.

Meeting the deadline for the nearly final version of the consumer and business operating system is crucial to ensuring Windows XP is ready for the scheduled Oct. 25 launch. In preparation, Microsoft this week started notifying those who had signed up for a paid preview that they could place their orders.

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