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The spokeswoman said Microsoft is aware that some customers are pushing for an extension to the deadline -- more than 160,000 people have signed a "Save XP" petition launched by Infoworld magazine, for example. But the company has also done its own research among partners and customers, and feels that "the dates are right," she said, speaking on behalf of Microsoft.

"We feel we've made the right accommodations for customers in certain segments who may need more time to transition to Windows Vista," she said. "But as Steve noted, we maintain a constant stance of listening to our customers and our partners. That's what is guiding our plan, and will continue to guide us going forward."

The "accommodations" refer to several exceptions that Microsoft has made to the June 30 deadline. For example, companies that make volume purchases of Vista Business or Vista Ultimate can ask their vendor to "downgrade" their license to Windows XP. Microsoft has also made exceptions for the emerging class of small, ultra-low-cost PCs, and it will continue to provide Windows XP Starter Edition for PCs sold in emerging markets.

Retailers and PC vendors can also continue to sell any backlog of Windows XP licenses that they bought before the June 30 deadline. Beyond those exceptions, most new Windows licenses purchased after June 30 will be for Windows Vista.