Microsoft Corp. had sold 60 million Windows Vista licenses as of the end of June, including 20 million copies sold since mid-May, the company said on Thursday.

The world's largest software maker disclosed the new sales figures on Vista, the latest version of its dominant Windows operating system released on January 30, at its annual meeting with financial analysts.

Microsoft Chief Executive Steve Ballmer took the stage at the company's headquarters in Redmond, Washington with a message that the software maker can still deliver growth by expanding its core desktop and server software business while succeeding in new areas like Web services.

Windows Vista is at the core of Ballmer's vision. New versions of Office and Windows, Microsoft's bread-and-butter software products, are yielding higher-than-expected renewal of multi-year agreements with large organizations, Ballmer said.

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