Jan. 18, 2007 -- Microsoft is offering three new ways to purchase its latest operating system, Windows Vista, the company announced Thursday.

Windows Anytime Upgrade allows customers to upgrade their existing edition of Windows Vista online, while first-time Vista-users can purchase and download the software directly from the Windows Marketplace, the company said.

For a limited time, customers who buy retail copies of Windows Vista Ultimate can also download two additional copies of Windows Vista Home Premium at a reduced price, the company said.

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